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Phoned-in library bomb threat evacuates residence halls; determined a hoax

AI-generated · every claim is source-linked
CAbomb threatemergency notificationmedium confidence
Confirmed HoaxDetermined to be a hoax. The institutional response is documented because it reveals how the alert system performed under a perceived real threat.

On the night of February 19, 2025, a phoned-in bomb threat to the Tanimura and Antle Family Library at California State University, Monterey Bay prompted evacuation of the library and Area One residence halls. The first OtterAlert went out at 10:05 PM PST, 45 minutes after a student-assistant received the threatening call at the library front desk at 9:20 PM PST. The all-clear came just before 1 AM PST Thursday morning after a multi-agency K-9 sweep with the Monterey County Sheriff's Office Explosives team.

Alerts
3
Response
45 min
Killed
0
Injured
0
Institution
California State University, Monterey Bay
Public Masters · CA
All CSUMB cases →
~7,000 studentsOtterAlert
Documented Timeline

Alert Sequence

3 messages in sequence · 1 verified verbatim

Some messages in this sequence are documented (their existence, timing, and channel are sourced) but their exact wording is not preserved in the public record. Those entries appear as placeholders; only confirmed text is displayed.

INITIAL ALERTEmail
an emergency has occurred at {the library}, police officers are responding. Library has been evacuated. Stay Clear of the area.
The curly braces around 'the library' and the lowercase 'an emergency has occurred' reflect template-engine syntax exposed in the live message
OtterAlert is intentionally non-specific in initial messaging to avoid panic, per CSUMB Emergency Manager Ken Folsom
UPDATESMS
Wording not preserved
A update message is documented at this point in the sequence, but its exact wording is not preserved in the public record. The public edition displays only confirmed alert text.
ALL CLEARSMS
Wording not preserved
A all clear message is documented at this point in the sequence, but its exact wording is not preserved in the public record. The public edition displays only confirmed alert text.
Message elements

How the first alert is built

To check this alert, Claude (an AI) read it in full 25 separate times, independently. Each read decided whether the message answers each of the six questions and gave a short reason. A final reviewer then weighed all 25 and wrote the plain-English verdict you see when you open a row. The score (for example 22/25) is how many reads agreed; the 25 individual reads are tucked underneath if you want to check them.

an emergency has occurred at {the library}, police officers are responding. Library has been evacuated. Stay Clear of the area.

  • Sourcepresent25/25

    Final assessment

    All reads agree the source is identified, naming "police officers are responding" as the responding authority.

    Who is sending the alert and who is responding. People act faster on a message from a clearly identifiable, credible sender, such as a named department, the police, or a branded alert system, than on an anonymous notice. A branded signature counts.

    See all 25 individual reads
    1. present: The text names "police officers" as the responding authority.
    2. present: The message says "police officers are responding", naming a responding authority.
    3. present: The text names "police officers" responding and "{the library}" as the issuing context, identifying a responding authority.
    4. present: It names "police officers are responding" as the responding authority.
    5. present: It says "police officers are responding", naming a responding authority.
    6. present: The text names "police officers" as responding authority.
    7. present: It states "police officers are responding", naming a responding authority.
    8. present: Names "police officers are responding" as the responding authority.
    9. present: The text says "police officers are responding", naming a responding authority.
    10. present: The text names "police officers" responding, identifying a responding authority.
    11. present: It names "police officers" as the responding authority.
    12. present: The text names "police officers" as the responding authority, identifying a source.
    13. present: It names "police officers" as responding authority, identifying who is acting on the message.
    14. present: It names "police officers are responding", identifying a responding authority.
    15. present: The text says "police officers are responding," naming a responding authority.
    16. present: The message says "police officers are responding", naming a responding authority.
    17. present: It names "police officers are responding", identifying a responding authority.
    18. present: It names "police officers" responding, identifying a responding authority.
    19. present: The message says "police officers are responding", naming a responding authority.
    20. present: The text names "police officers" responding and refers to "{the library}", an issuing/responding authority counts as source.
    21. present: It names "police officers" responding, identifying a responding authority.
    22. present: The text names "police officers are responding" as the responding authority.
    23. present: It says "police officers are responding," naming a responding authority.
    24. present: It names "police officers" as responding authority, identifying a source.
    25. present: It names "police officers" as responding authority.
  • Hazardabsent0/25

    Final assessment

    Unanimous that no specific hazard is named; it says only that "an emergency has occurred".

    What the threat actually is. A complete warning names the specific danger, such as a shooter, a fire, a tornado, or a gas leak, rather than a vague emergency, because people decide what to do based on what they are facing.

    See all 25 individual reads
    1. absent: It says only "an emergency has occurred", a generic word that does not name a specific hazard.
    2. absent: It says only "an emergency has occurred", a generic word that does not name a specific hazard.
    3. absent: It says only "an emergency has occurred", a generic word that does not name a specific hazard.
    4. absent: It says "an emergency has occurred" but never names a specific hazard, which is too generic to count.
    5. absent: It says only "an emergency has occurred", a generic word that names no specific hazard.
    6. absent: Only "an emergency has occurred" appears; no specific hazard is named.
    7. absent: It says only "an emergency has occurred", a generic word that does not name a specific hazard.
    8. absent: Says only "an emergency has occurred", a generic word that does not name the specific threat.
    9. absent: It only says "an emergency has occurred", a generic word that does not name a specific hazard.
    10. absent: It says "an emergency has occurred" without naming a specific threat, so the hazard is unstated.
    11. absent: It says only "an emergency has occurred", a generic word that does not name a specific hazard.
    12. absent: It says only "an emergency has occurred" without naming a specific threat.
    13. absent: It says only "an emergency has occurred" with no specific threat named, and generic "emergency" does not count.
    14. absent: It says only "an emergency has occurred", a generic word that does not name a specific hazard.
    15. absent: It says only "an emergency has occurred," a generic word that does not name a specific hazard.
    16. absent: It says only "an emergency has occurred", a generic term that does not name a specific hazard.
    17. absent: It says only "an emergency has occurred", a generic word that names no specific hazard.
    18. absent: It says only "an emergency has occurred", a generic word that does not name the specific threat.
    19. absent: It says only "an emergency has occurred", which is generic and does not name a specific hazard.
    20. absent: It says only "an emergency has occurred", a generic word that does not name a specific threat.
    21. absent: It says only "an emergency has occurred", a generic word that does not name a specific hazard.
    22. absent: It says only "an emergency has occurred" and never names a specific hazard.
    23. absent: It states only that "an emergency has occurred," a generic word that does not name a specific threat.
    24. absent: It says only "an emergency has occurred", a generic term that does not name a specific hazard.
    25. absent: "an emergency has occurred" names no specific hazard, only a generic emergency.
  • Locationpresent25/25

    Final assessment

    All reads agree a specific place is named, "the library", with instruction to stay clear of "the area".

    Where the threat is. Saying whether danger is in a specific building, a part of campus, or area-wide lets people judge their own proximity and choose a safe direction. Without a where, a warning is hard to act on precisely.

    See all 25 individual reads
    1. present: It places the event at "the library" and tells people to stay clear of "the area".
    2. present: It locates the event at "{the library}" and says to "Stay Clear of the area".
    3. present: It locates the event at "the library" and instructs to "Stay Clear of the area", a specific place.
    4. present: It identifies "the library" as the location of the incident.
    5. present: It places the event at "the library" and tells people to "Stay Clear of the area".
    6. present: It identifies "the library" and "the area" as the location.
    7. present: It locates the event at "the library", a specific place.
    8. present: Locates it "at {the library}", a named place.
    9. present: It names "{the library}" and "the area", a specific place.
    10. present: It locates the event at "the library" which has "been evacuated", a specific place.
    11. present: It names "{the library}" and "the area" as the location.
    12. present: It locates the event at "the library" and tells people to stay clear of "the area".
    13. present: It locates the event at "the library" which has been evacuated, a specific place.
    14. present: It locates the event at "the library" and tells people to "Stay Clear of the area".
    15. present: It identifies "the library" and "the area" as the location.
    16. present: It locates the event at "the library", a specific building.
    17. present: It locates the event at "the library" and "the area", a named place.
    18. present: It locates the event at "the library" which has been evacuated, a specific place.
    19. present: It locates the event "at {the library}" and refers to "the area".
    20. present: It locates the event at "{the library}" and the surrounding "area", a specific place.
    21. present: It specifies "the library" as the place.
    22. present: It locates the event at "the library" which has been evacuated.
    23. present: It locates the event at "{the library}" and tells people to "Stay Clear of the area."
    24. present: It locates the event at "the library" and references "the area".
    25. present: It locates the event at "the library" which "has been evacuated."
  • Guidancepresent25/25

    Final assessment

    Unanimous that a protective action is given: "Stay Clear of the area".

    The protective action to take. A clear, specific instruction, such as shelter in place, evacuate, avoid the area, or run-hide-fight, drives faster and more correct protective behavior than describing the threat alone.

    See all 25 individual reads
    1. present: It instructs recipients to "Stay Clear of the area", a protective action.
    2. present: It instructs recipients to "Stay Clear of the area", a protective action.
    3. present: It directs recipients to "Stay Clear of the area", a protective instruction.
    4. present: It instructs recipients to "Stay Clear of the area", a protective action.
    5. present: It instructs recipients to "Stay Clear of the area", a protective action.
    6. present: It instructs "Stay Clear of the area," a protective action.
    7. present: It instructs recipients to "Stay Clear of the area", a protective action.
    8. present: Instructs recipients to "Stay Clear of the area", a protective action.
    9. present: It instructs recipients to "Stay Clear of the area", a protective action.
    10. present: It instructs recipients to "Stay Clear of the area", a protective action.
    11. present: It instructs recipients to "Stay Clear of the area", a protective action.
    12. present: It instructs recipients to "Stay Clear of the area", a protective action.
    13. present: It instructs recipients to "Stay Clear of the area", a protective action.
    14. present: It instructs "Stay Clear of the area", a protective action for recipients.
    15. present: It instructs recipients to "Stay Clear of the area," a protective action.
    16. present: It tells recipients to "Stay Clear of the area", a protective action.
    17. present: It instructs recipients to "Stay Clear of the area", a protective action.
    18. present: It instructs recipients to "Stay Clear of the area", a protective action.
    19. present: It instructs recipients to "Stay Clear of the area", a protective action.
    20. present: It instructs recipients to "Stay Clear of the area", a protective action.
    21. present: It instructs recipients to "Stay Clear of the area", a protective action.
    22. present: It instructs recipients to "Stay Clear of the area".
    23. present: It instructs recipients to "Stay Clear of the area," a protective action.
    24. present: It instructs recipients to "Stay Clear of the area", a protective action.
    25. present: It instructs recipients to "Stay Clear of the area."
  • Timeabsent0/25

    Final assessment

    Unanimous that no clock time, date, or recency cue appears in the text.

    When the message applies. A timestamp, the word now or immediately, or a phrase like until further notice tells the reader whether the danger is current and how quickly to act.

    See all 25 individual reads
    1. absent: No clock time, date, or recency cue such as "now" appears.
    2. absent: No clock time, date, or recency cue such as "now" or "immediately" appears.
    3. absent: No clock time, date, or recency cue such as "now" or "immediately" appears.
    4. absent: No clock time, date, or recency cue such as "now" appears in the text.
    5. absent: No clock time, date, or recency cue such as "now" appears in the text.
    6. absent: No clock time, date, or recency cue appears.
    7. absent: No clock time, date, or recency cue like "now" appears in the text.
    8. absent: No clock time, date, or recency cue such as "now" appears.
    9. absent: No clock time, date, or recency cue appears in the text.
    10. absent: No clock time, date, or recency cue such as "now" or "immediately" appears.
    11. absent: No clock time, date, or recency cue appears in the text.
    12. absent: No clock time, date, or recency cue such as "now" appears.
    13. absent: No clock time, date, or recency cue such as "now" or "immediately" appears in the text.
    14. absent: No clock time, date, or recency cue such as "now" appears.
    15. absent: No clock time, date, or recency cue such as "now" appears in the text.
    16. absent: No clock time, date, or recency cue such as "now" appears.
    17. absent: No clock time, date, or recency cue such as "now" or "immediately" appears.
    18. absent: No clock time, date, or recency cue such as "now" or "immediately" is present.
    19. absent: No clock time, date, or recency word such as "now" appears.
    20. absent: No clock time, date, or recency cue such as "now" or "immediately" appears.
    21. absent: No clock time, date, or recency cue appears in the text.
    22. absent: No clock time, date, or recency cue like "now" appears in the text.
    23. absent: No clock time, date, or recency cue such as "now" appears in the text.
    24. absent: No clock time, date, or recency cue such as "now" appears in the text.
    25. absent: No clock time, date, or recency cue such as "now" appears.
  • Impactabsent0/25

    Final assessment

    Absent by unanimous agreement; all reads find it names an emergency and library evacuation but states no specific harm or consequence.

    What the hazard could do to the people in its path. Beyond naming the threat, a complete warning conveys its potential consequences or severity, such as that a tornado can level buildings or that a leak could be explosive, so recipients grasp how much danger they are in. Research on warning message content finds that a concrete impact statement helps people personalize their risk and act sooner.

    See all 25 individual reads
    1. absent: Names an emergency at the library with evacuation and stay clear guidance but no stated harm or severity.
    2. absent: Reports an emergency with library evacuation but states no specific harm or severity.
    3. absent: It cites an emergency and evacuation of the library and tells people to stay clear but states no harm or severity.
    4. absent: It declares an emergency with police responding and evacuation but states no specific harm or severity.
    5. absent: Reports an emergency and that the library was evacuated but states no specific harm or danger.
    6. absent: It reports an emergency and evacuation but states no specific harm or severity.
    7. absent: Names an emergency at the library and says stay clear but states no specific danger.
    8. absent: Reports an emergency with police responding and evacuation but states no specific harm.
    9. absent: Cites an emergency at the library with evacuation but states no specific harm or danger.
    10. absent: Reports an emergency with police responding and library evacuated but states no specific danger or harm.
    11. absent: Reports an emergency and evacuation at the library but states no harm or what the hazard could do.
    12. absent: Names a library emergency with evacuation and asks people to stay clear but states no specific harm.
    13. absent: Calls it an emergency with police responding and evacuation but states no specific harm or severity.
    14. absent: Reports an emergency and evacuation at the library but states no specific harm or severity.
    15. absent: It cites an emergency at the library with evacuation but states no specific harm or severity.
    16. absent: Cites an emergency and evacuation with no stated harm or potential consequence beyond naming it.
    17. absent: Names an emergency and evacuation but states no specific harm or how serious it is.
    18. absent: Cites a bomb threat emergency and evacuation but states no specific harm or severity.
    19. absent: It names a bomb threat emergency and announces evacuation but states no potential harm or severity.
    20. absent: Declares an emergency with police responding and evacuation but states no specific harm or consequence.
    21. absent: Cites an emergency and evacuation with police responding but states no harm or severity.
    22. absent: It cites an emergency and library evacuation but states no specific harm or danger.
    23. absent: Reports an emergency and evacuation at the library with no stated harm or danger.
    24. absent: Names an emergency at the library with evacuation but states no specific danger or consequence.
    25. absent: It cites an emergency and evacuation with police responding but states no specific danger or harm.

Systematic AI judgments with visible reasoning, not human-validated codings.

About this analysis
Context

Background

At 9:20 PM PST on Wednesday, February 19, 2025, a student assistant managing the front desk of the Tanimura and Antle Family Library received a phone call saying there was a bomb in the library. The library was evacuated and CSUMB's first OtterAlert went out at 10:05 PM PST, a 45-minute delay that CSUMB Emergency Manager Ken Folsom said reflected the time required to verify the threat. Resident advisors then began evacuating Area One residence halls door-to-door, with students directed to the Otter Student Union. CSUMB University Police, Marina Police and the Monterey County Sheriff's Office Explosives K-9 team conducted the search. No devices were found and the all-clear was issued just before 1 AM PST. The FBI joined the hoax investigation.
Analysis

Key Findings

The first OtterAlert exposed template syntax ('{the library}' rendered with curly braces) illustrating how mass-notification systems can leak unprocessed placeholder text under time pressure
The 45-minute gap between threat receipt (9:20 PM PST) and first alert (10:05 PM PST) is consistent with CSUMB's stated policy of verifying before broadcasting
Door-to-door RA evacuation of residence halls is standard for nighttime threats when residents may be asleep and not check phones
Outcome
No explosive devices were found. The FBI joined the investigation. The threat was determined to be a hoax. Students were sent to the Otter Student Union for shelter during the search.
Provenance

Sources

  1. Student Paper
  2. Student Paper
  3. News
  4. News
Cite this case

Campus Alert Archive. "California State University, Monterey Bay: Phoned-in library bomb threat evacuates residence halls; determined a hoax." Incident of February 19, 2025. Added May 2026; last updated July 2026. https://campusalertarchive.com/case/cal-state-monterey-bay-library-bomb-threat-2025-02-19/

Download case JSON

Alert text quoted on this page remains the work of the issuing institution; the archive is a secondary source.

Tags
bomb-threatlibraryevacuationcaliforniacsumbk9-searchfbi-investigationtemplate-leakresidence-hallshoaxHoax
Added May 2026Updated July 2026Via ingestion