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Report of an armed person traced to a student in a Halloween costume; three-hour lockdown

AI-generated · every claim is source-linked
CTarmed personemergency notificationmedium confidence
UnfoundedNo evidence of an actual threat was found. The institutional response is documented because the alert communication is identical to what would occur during a real incident.

Around noon on November 4, 2013, 911 callers reported a suspicious, seemingly armed person on the Central Connecticut State University campus in New Britain, triggering a roughly three-hour lockdown. A witness described a man in camouflage pants, knee pads, a body-armor vest, and a paintball mask with a katana strapped to his back. The 'armed person' turned out to be 21-year-old senior David Kyem in a Halloween ninja costume; no shots were fired and no firearm was recovered.

Alerts
3
Response
Killed
0
Injured
0
Institution
Central Connecticut State University
Public Masters · CT
All CCSU cases →
~11,000 studentsCCSU Alert
Documented Timeline

Alert Sequence

3 messages in sequence · 3 verified verbatim

INITIAL ALERTTwitter/X
Campus emergency. Seek shelter. Lock doors, close windows. We will communicate when we have more info. This is not a drill.
Posted on the official CCSU Twitter (X) account as the initial emergency notification after ~noon 911 calls described a man who 'appeared to be armed' with a sword and possible handgun
'This is not a drill' was appended to override the routine-test reflex, the same phrasing pattern seen in the contemporaneous Yale shelter-in-place alert nine months earlier
Terse, action-first construction ('Seek shelter. Lock doors, close windows.') with an explicit promise of follow-up ('We will communicate when we have more info')
UPDATETwitter/X
#CCSU police is on the scene. Please stay indoors and away from windows.
Posted from the verified CCSU X account during the active search of campus
Reiterates the 'stay indoors and away from windows' shelter posture while confirming police presence on scene
Hashtag-prefixed ('#CCSU') for discoverability, reflects the 2013-era practice of routing campus emergency updates through public Twitter rather than a closed SMS-only channel
ALL CLEARTwitter/X
The sounds that you just heard was campus police indicating that the campus is ALL CLEAR #ccsu. You may now leave the buildings.
The verbatim all-clear posted to the official CCSU Twitter (X) account after the roughly three-hour lockdown ended with three people taken into custody and no weapon recovered.
References an audible campus-police siren signal ('The sounds that you just heard') rather than relying solely on the text channel, a layered notification used because the lockdown ran across a public, outdoor campus.
This is a true all-clear: it explicitly lifts the shelter order ('You may now leave the buildings'), distinguishing it from the shelter directives in the earlier alerts.
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.

Campus emergency. Seek shelter. Lock doors, close windows. We will communicate when we have more info. This is not a drill.

  • Sourceabsent2/25

    Final assessment

    Strong majority (23 of 25) find no sender tag or named authority; a few read "We will communicate" as an implied institutional voice, but the source is absent.

    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. absent: No sender tag or named authority appears in the text.
    2. absent: No branded signature, sender, or named authority appears in the text.
    3. absent: No sender tag, branded signature, or named authority appears in the text.
    4. absent: No sender, branded signature, or responding authority is identified.
    5. present: It uses plural "We will communicate", an institutional sender.
    6. absent: No sender, branded signature, or agency is identified in the text.
    7. absent: No sender tag, university name, or named authority appears in the text.
    8. absent: No sender tag, university name, or named authority appears, only "Campus emergency".
    9. absent: No sender, branded signature, or named authority appears in the text.
    10. absent: No sender, branded signature, or responding authority is named in the text.
    11. absent: No sender or branded signature appears in the text.
    12. absent: No sender, agency, or branded signature appears in the text.
    13. absent: No sender tag, signature, or issuing authority is named in the text.
    14. absent: No sender tag, university name, or agency identifies the source.
    15. absent: No sender, signature, or named authority appears in this message.
    16. absent: No sender, authority, or branded signature is identified in the text.
    17. absent: No sender, branded tag, or named agency appears in the text.
    18. present: "We will communicate when we have more info" implies an institutional sender.
    19. absent: No sender, branded tag, or authority is named in the text.
    20. absent: No sender, agency, or branded signature is identified in the text.
    21. absent: No sender, branded signature, or named authority identifies who issued this message.
    22. absent: No sender, branded signature, or named authority is identified in the text.
    23. absent: No sender, branded signature, or named authority appears in the text.
    24. absent: No sender tag or issuing authority is identified in the text.
    25. absent: No sender tag, agency, or institution names itself in the text.
  • Hazardabsent0/25

    Final assessment

    Unanimous: "Campus emergency" is generic and names no specific threat, so the hazard is absent.

    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: "Campus emergency" is generic and names no specific hazard.
    2. absent: It says "Campus emergency" but names no specific threat or hazard.
    3. absent: "Campus emergency" names no specific threat or hazard.
    4. absent: No specific hazard is named; "Campus emergency" is generic and names no threat.
    5. absent: It only says "Campus emergency", a generic phrase that does not name the hazard.
    6. absent: No specific hazard is named, only "Campus emergency" which is generic.
    7. absent: It says "Campus emergency" but names no specific threat or hazard.
    8. absent: "Campus emergency" is generic and names no specific hazard.
    9. absent: No specific hazard named; "Campus emergency" is generic without naming the threat type.
    10. absent: No specific threat is named; "Campus emergency" is generic and the hazard is not stated.
    11. absent: It says "Campus emergency" only, a generic term that names no specific hazard.
    12. absent: No specific hazard is named; only "Campus emergency", which is generic.
    13. absent: It cites a "Campus emergency" but names no specific hazard.
    14. absent: "Campus emergency" names no specific hazard.
    15. absent: No specific hazard is named, only "Campus emergency" which is generic.
    16. absent: It says only "Campus emergency", which does not name the specific hazard.
    17. absent: No specific threat is named; "Campus emergency" is generic without naming the hazard.
    18. absent: No specific hazard is named; "Campus emergency" does not state the threat.
    19. absent: "Campus emergency" is generic; no specific hazard is named.
    20. absent: "Campus emergency" is generic and does not name a specific hazard.
    21. absent: It says "Campus emergency" but names no specific hazard, which is generic.
    22. absent: "Campus emergency" names no specific hazard, so no hazard is named.
    23. absent: No specific threat is named; only "Campus emergency", which is generic.
    24. absent: It cites "Campus emergency" but names no specific hazard or threat.
    25. absent: "Campus emergency" names no specific hazard type.
  • Locationpresent25/25

    Final assessment

    All 25 reads agree it refers to "Campus", a location reference, so location is present.

    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 refers to "Campus", a location.
    2. present: It refers to "Campus", a location reference.
    3. present: It refers to "Campus", a location.
    4. present: It specifies "Campus".
    5. present: It refers to "Campus", a location reference.
    6. present: It says "Campus", a location reference.
    7. present: It refers to "Campus".
    8. present: It refers to "Campus".
    9. present: It references "Campus".
    10. present: It refers to "Campus", a location.
    11. present: It refers to "Campus", a location.
    12. present: It references "Campus", a location.
    13. present: It refers to "Campus".
    14. present: It says "Campus emergency".
    15. present: "Campus" is referenced as the location.
    16. present: It says "Campus", a location.
    17. present: It refers to "Campus".
    18. present: It references "Campus" as the location.
    19. present: "Campus" is referenced as the location.
    20. present: It references "Campus", a location.
    21. present: It references "Campus", a location.
    22. present: It refers to "Campus", a location.
    23. present: It says "Campus", a location.
    24. present: It references "Campus" as the affected location.
    25. present: It says "Campus", a location reference.
  • Guidancepresent25/25

    Final assessment

    Unanimous: it instructs "Seek shelter. Lock doors, close windows", clear protective actions, so guidance is present.

    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: "Seek shelter. Lock doors, close windows" instructs protective actions.
    2. present: It instructs "Seek shelter. Lock doors, close windows", protective actions.
    3. present: It instructs "Seek shelter. Lock doors, close windows", protective actions.
    4. present: It instructs recipients to "Seek shelter", "Lock doors, close windows".
    5. present: It instructs "Seek shelter. Lock doors, close windows", protective actions.
    6. present: It instructs "Seek shelter", "Lock doors, close windows", protective actions.
    7. present: It instructs "Seek shelter. Lock doors, close windows".
    8. present: "Seek shelter. Lock doors, close windows" are protective instructions.
    9. present: It instructs "Seek shelter", "Lock doors, close windows".
    10. present: It instructs "Seek shelter. Lock doors, close windows", protective actions.
    11. present: It instructs "Seek shelter", "Lock doors, close windows", protective actions.
    12. present: It instructs "Seek shelter. Lock doors, close windows", protective actions.
    13. present: It instructs "Seek shelter. Lock doors, close windows".
    14. present: It instructs "Seek shelter. Lock doors, close windows".
    15. present: "Seek shelter. Lock doors, close windows" are protective instructions.
    16. present: It instructs "Seek shelter. Lock doors, close windows", protective actions.
    17. present: It instructs "Seek shelter. Lock doors, close windows".
    18. present: It instructs to "Seek shelter", "Lock doors, close windows".
    19. present: "Seek shelter. Lock doors, close windows" are protective actions.
    20. present: It instructs "Seek shelter", "Lock doors, close windows", protective actions.
    21. present: It instructs "Seek shelter. Lock doors, close windows", protective actions.
    22. present: It instructs recipients to "Seek shelter", "Lock doors, close windows", protective actions.
    23. present: It instructs "Seek shelter. Lock doors, close windows", protective actions.
    24. present: It instructs "Seek shelter. Lock doors, close windows", protective actions.
    25. present: "Seek shelter. Lock doors, close windows" are protective instructions.
  • Timeabsent0/25

    Final assessment

    All 25 reads agree no clock time, date, or recency cue appears, so timing is absent.

    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 appears.
    2. absent: No clock time, date, or recency cue appears in the text.
    3. absent: No clock time, date, or recency word appears.
    4. absent: No clock time, date, or recency cue is present.
    5. absent: No clock time, date, or recency cue such as "now" appears.
    6. absent: No clock time, date, or recency cue appears, "not a drill" is not a time.
    7. absent: No clock time, date, or recency cue appears.
    8. absent: No clock time, date, or recency cue appears.
    9. absent: No clock time, date, or recency cue appears.
    10. absent: No clock time, date, or recency cue appears.
    11. absent: No clock time, date, or recency cue such as "now" appears in the text.
    12. absent: No clock time, date, or recency cue appears.
    13. absent: No clock time, date, or recency cue appears.
    14. absent: "This is not a drill" is not a time or recency cue.
    15. absent: No clock time, date, or recency word appears in the text.
    16. absent: No clock time, date, or recency cue appears.
    17. absent: No clock time, date, or recency cue appears.
    18. absent: No clock time, date, or recency cue appears; "This is not a drill" is not a time reference.
    19. absent: No clock time, date, or recency cue appears.
    20. absent: No clock time, date, or recency word like "now" appears; "not a drill" is not timing.
    21. absent: No clock time, date, or recency word such as "now" appears.
    22. absent: No clock time, date, or recency cue appears in the text.
    23. absent: No clock time, date, or recency cue appears.
    24. absent: No clock time, date, or recency word appears in the text.
    25. absent: No clock time, date, or recency cue appears in the text.
  • Impactabsent0/25

    Final assessment

    Absent unanimously across all 25 reads. The message declares a campus emergency and directs sheltering but states no hazard consequence or potential harm to people or property.

    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: It declares a campus emergency and tells people to seek shelter but never states what danger or harm exists.
    2. absent: This says campus emergency and to seek shelter but states no specific danger or potential harm beyond naming an emergency.
    3. absent: Says campus emergency and to seek shelter but does not state what the hazard could do.
    4. absent: It calls a campus emergency and directs shelter but never states any harm, danger, or potential consequence beyond naming an emergency.
    5. absent: Says campus emergency and seek shelter with no stated danger or consequence beyond naming an emergency.
    6. absent: This names a campus emergency and gives shelter guidance but states no specific harm or consequence of the hazard.
    7. absent: Calls it a campus emergency and gives shelter guidance but states no specific danger or potential consequence.
    8. absent: Says campus emergency and to seek shelter but does not state what danger could happen or how serious it is.
    9. absent: Says campus emergency and seek shelter with not a drill but states no specific danger or potential harm.
    10. absent: It names a campus emergency and says to seek shelter but states no specific danger or consequence.
    11. absent: Says campus emergency and not a drill but gives only sheltering guidance with no stated danger or potential harm.
    12. absent: It names a campus emergency and gives shelter guidance but states no specific danger or consequence the hazard could cause.
    13. absent: It names a campus emergency and directs sheltering but states no consequence or harm the hazard could cause.
    14. absent: Says campus emergency and not a drill but gives only protective guidance without stating what danger could occur or its severity.
    15. absent: Says campus emergency and to seek shelter but gives no stated danger or potential consequence.
    16. absent: Says campus emergency and seek shelter but gives no statement of what danger could do or how serious it is.
    17. absent: Says campus emergency and not a drill but states no specific danger or consequence.
    18. absent: Says campus emergency and seek shelter with no stated danger or potential harm beyond naming an emergency.
    19. absent: Says campus emergency and seek shelter but gives no stated danger or potential harm.
    20. absent: Says campus emergency and not a drill but gives only sheltering guidance with no stated danger or consequence.
    21. absent: Says campus emergency and seek shelter but gives no statement of what danger could do; not a drill is urgency not impact.
    22. absent: Says campus emergency and to seek shelter but conveys no stated danger or potential harm.
    23. absent: Calls it a campus emergency and gives shelter guidance but does not state what the hazard could do.
    24. absent: Says campus emergency and seek shelter but never states what harm could result.
    25. absent: This only directs people to seek shelter and lock doors without stating any specific danger or consequence.

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

About this analysis
Context

Background

Around noon on November 4, 2013, 911 callers reported a seemingly armed, suspicious person at Central Connecticut State University in New Britain, prompting a roughly three-hour campus lockdown. A witness described a man in camouflage pants, knee pads, a body-armor vest, and a paintball mask with a katana strapped to his back. Police identified him as 21-year-old senior David Kyem, son of a CCSU professor; his father told WFSB the son had attended a multi-day party at UConn and returned to campus still in his Halloween ninja costume. CCSU issued a campus alert telling people to seek shelter, and two nearby New Britain schools locked down as a precaution. No shots were fired and no firearm was recovered; Kyem was charged with breach of peace. The case is an early, vivid example of the 'costume-as-weapon-report' pattern that recurs across the archive, and it shows how a regional Connecticut public's emergency-notification system handled a sustained, ultimately unfounded armed-person scare without injury.
Analysis

Key Findings

A report of a seemingly armed person around noon on November 4, 2013 put CCSU in a roughly three-hour lockdown
The 'armed person' was a 21-year-old student wearing a Halloween ninja costume with a katana, body armor, and a paintball mask
No shots were fired and no firearm was recovered; the student was charged with breach of peace
Two nearby New Britain schools also locked down as a precaution, showing how a campus scare can ripple into surrounding K-12 districts
Outcome
Police found no real threat: no shots were fired and no firearm was recovered. David Kyem, 21, son of a CCSU professor, was arrested and charged with breach of peace. Two nearby New Britain schools were also briefly locked down as a precaution.
Provenance

Sources

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

Campus Alert Archive. "Central Connecticut State University: Report of an armed person traced to a student in a Halloween costume; three-hour lockdown." Incident of November 4, 2013. Added May 2026. https://campusalertarchive.com/case/central-connecticut-state-university-costume-lockdown-2013-11-04/

Download case JSON

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

Tags
armed-personlockdownconnecticutnew-britainhalloweencostumefalse-alarmemergency-notificationUnfounded
Added May 2026Updated May 2026Via ingestion