Campus Alert Archive
U-M

All clear after Mason Hall unconfirmed active shooter report

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MIswattingemergency notificationhigh confidence
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Confirmed HoaxDetermined to be a hoax. The institutional response is documented because it reveals how the alert system performed under a perceived real threat.

University of Michigan DPSS published this notice. Full text is preserved from the official DPSS news page.

Alerts
1
Response
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Killed
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Injured
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Institution
University of Michigan
Public R1 · MI
All U-M cases →
~51,000 studentsDPSS / U-M Emergency Alert
Official alert policy
Read when and how U-M says it will use U-M Emergency Alert: summarized, quoted, and analyzed.
Documented Timeline

Alert Sequence

1 message in sequence · 1 verified verbatim

Confirmed wording is transcribed character-for-character from a primary source. Use Verify this quote under each message to open that source in a new tab and compare the text yourself.

ALL CLEARMulti-channel
Verified verbatim814 chars
All Clear - 7:50 p.m. - Police have determined there is no threat to the community. Buildings are open. All clear. Update 3 - 6:35 p.m. -  There continues to be no indication of an active threat to the community. Police continue to investigate. Please stay away from Angell and Mason Halls. Update 2 - 5:32 p.m. - There does not appear to be an active threat to the community. DPSS continues to investigate. Continue to stay clear of area. Update 1 - 5:17 p.m. - Unconfirmed reports of an active shooter, officers are in the area checking. Stay away from the area of Mason Hall. Original - 4:40 p.m. -  UM EAlert Ann Arbor: Active shooter in Mason Hall. Run, hide, fight. www.dpss.umich.edu. For more information about this event visit: https://publicaffairs.vpcomm.umich.edu/unfounded-reports-of-shots-fired/
Verify this quote
U-M DPSS news / emergency alert pagenews.dpss.umich.edufind archived copies
Transcribed from official news.dpss.umich.edu post HTML.
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.

All Clear - 7:50 p.m. - Police have determined there is no threat to the community. Buildings are open. All clear. Update 3 - 6:35 p.m. -  There continues to be no indication of an active threat to the community. Police continue to investigate. Please stay away from Angell and Mason Halls. Update 2 - 5:32 p.m. - There does not appear to be an active threat to the community. DPSS continues to investigate. Continue to stay clear of area. Update 1 - 5:17 p.m. - Unconfirmed reports of an active shooter, officers are in the area checking. Stay away from the area of Mason Hall. Original - 4:40 p.m. -  UM EAlert Ann Arbor: Active shooter in Mason Hall. Run, hide, fight. www.dpss.umich.edu. For more information about this event visit: https://publicaffairs.vpcomm.umich.edu/unfounded-reports-of-shots-fired/

  • Sourcepresent25/25

    Final assessment

    All 25 reads agree s is present in this DPSS notice.

    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: Source pass 1: U-M DPSS official notice branding.
    2. present: Source pass 2: U-M DPSS official notice branding.
    3. present: Source pass 3: U-M DPSS official notice branding.
    4. present: Source pass 4: U-M DPSS official notice branding.
    5. present: Source pass 5: U-M DPSS official notice branding.
    6. present: Source pass 6: U-M DPSS official notice branding.
    7. present: Source pass 7: U-M DPSS official notice branding.
    8. present: Source pass 8: U-M DPSS official notice branding.
    9. present: Source pass 9: U-M DPSS official notice branding.
    10. present: Source pass 10: U-M DPSS official notice branding.
    11. present: Source pass 11: U-M DPSS official notice branding.
    12. present: Source pass 12: U-M DPSS official notice branding.
    13. present: Source pass 13: U-M DPSS official notice branding.
    14. present: Source pass 14: U-M DPSS official notice branding.
    15. present: Source pass 15: U-M DPSS official notice branding.
    16. present: Source pass 16: U-M DPSS official notice branding.
    17. present: Source pass 17: U-M DPSS official notice branding.
    18. present: Source pass 18: U-M DPSS official notice branding.
    19. present: Source pass 19: U-M DPSS official notice branding.
    20. present: Source pass 20: U-M DPSS official notice branding.
    21. present: Source pass 21: U-M DPSS official notice branding.
    22. present: Source pass 22: U-M DPSS official notice branding.
    23. present: Source pass 23: U-M DPSS official notice branding.
    24. present: Source pass 24: U-M DPSS official notice branding.
    25. present: Source pass 25: U-M DPSS official notice branding.
  • Hazardpresent25/25

    Final assessment

    All 25 reads agree h is present in this DPSS notice.

    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. present: Hazard pass 1: U-M Emergency Alert All Clear After Mason Hall Report.
    2. present: Hazard pass 2: U-M Emergency Alert All Clear After Mason Hall Report.
    3. present: Hazard pass 3: U-M Emergency Alert All Clear After Mason Hall Report.
    4. present: Hazard pass 4: U-M Emergency Alert All Clear After Mason Hall Report.
    5. present: Hazard pass 5: U-M Emergency Alert All Clear After Mason Hall Report.
    6. present: Hazard pass 6: U-M Emergency Alert All Clear After Mason Hall Report.
    7. present: Hazard pass 7: U-M Emergency Alert All Clear After Mason Hall Report.
    8. present: Hazard pass 8: U-M Emergency Alert All Clear After Mason Hall Report.
    9. present: Hazard pass 9: U-M Emergency Alert All Clear After Mason Hall Report.
    10. present: Hazard pass 10: U-M Emergency Alert All Clear After Mason Hall Report.
    11. present: Hazard pass 11: U-M Emergency Alert All Clear After Mason Hall Report.
    12. present: Hazard pass 12: U-M Emergency Alert All Clear After Mason Hall Report.
    13. present: Hazard pass 13: U-M Emergency Alert All Clear After Mason Hall Report.
    14. present: Hazard pass 14: U-M Emergency Alert All Clear After Mason Hall Report.
    15. present: Hazard pass 15: U-M Emergency Alert All Clear After Mason Hall Report.
    16. present: Hazard pass 16: U-M Emergency Alert All Clear After Mason Hall Report.
    17. present: Hazard pass 17: U-M Emergency Alert All Clear After Mason Hall Report.
    18. present: Hazard pass 18: U-M Emergency Alert All Clear After Mason Hall Report.
    19. present: Hazard pass 19: U-M Emergency Alert All Clear After Mason Hall Report.
    20. present: Hazard pass 20: U-M Emergency Alert All Clear After Mason Hall Report.
    21. present: Hazard pass 21: U-M Emergency Alert All Clear After Mason Hall Report.
    22. present: Hazard pass 22: U-M Emergency Alert All Clear After Mason Hall Report.
    23. present: Hazard pass 23: U-M Emergency Alert All Clear After Mason Hall Report.
    24. present: Hazard pass 24: U-M Emergency Alert All Clear After Mason Hall Report.
    25. present: Hazard pass 25: U-M Emergency Alert All Clear After Mason Hall Report.
  • Locationpresent25/25

    Final assessment

    All 25 reads agree l is present in this DPSS notice.

    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: Location pass 1: to the community.
    2. present: Location pass 2: to the community.
    3. present: Location pass 3: to the community.
    4. present: Location pass 4: to the community.
    5. present: Location pass 5: to the community.
    6. present: Location pass 6: to the community.
    7. present: Location pass 7: to the community.
    8. present: Location pass 8: to the community.
    9. present: Location pass 9: to the community.
    10. present: Location pass 10: to the community.
    11. present: Location pass 11: to the community.
    12. present: Location pass 12: to the community.
    13. present: Location pass 13: to the community.
    14. present: Location pass 14: to the community.
    15. present: Location pass 15: to the community.
    16. present: Location pass 16: to the community.
    17. present: Location pass 17: to the community.
    18. present: Location pass 18: to the community.
    19. present: Location pass 19: to the community.
    20. present: Location pass 20: to the community.
    21. present: Location pass 21: to the community.
    22. present: Location pass 22: to the community.
    23. present: Location pass 23: to the community.
    24. present: Location pass 24: to the community.
    25. present: Location pass 25: to the community.
  • Guidancepresent25/25

    Final assessment

    All 25 reads agree g is present in this DPSS notice.

    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: Guidance pass 1: avoid area, report, or safety tips present.
    2. present: Guidance pass 2: avoid area, report, or safety tips present.
    3. present: Guidance pass 3: avoid area, report, or safety tips present.
    4. present: Guidance pass 4: avoid area, report, or safety tips present.
    5. present: Guidance pass 5: avoid area, report, or safety tips present.
    6. present: Guidance pass 6: avoid area, report, or safety tips present.
    7. present: Guidance pass 7: avoid area, report, or safety tips present.
    8. present: Guidance pass 8: avoid area, report, or safety tips present.
    9. present: Guidance pass 9: avoid area, report, or safety tips present.
    10. present: Guidance pass 10: avoid area, report, or safety tips present.
    11. present: Guidance pass 11: avoid area, report, or safety tips present.
    12. present: Guidance pass 12: avoid area, report, or safety tips present.
    13. present: Guidance pass 13: avoid area, report, or safety tips present.
    14. present: Guidance pass 14: avoid area, report, or safety tips present.
    15. present: Guidance pass 15: avoid area, report, or safety tips present.
    16. present: Guidance pass 16: avoid area, report, or safety tips present.
    17. present: Guidance pass 17: avoid area, report, or safety tips present.
    18. present: Guidance pass 18: avoid area, report, or safety tips present.
    19. present: Guidance pass 19: avoid area, report, or safety tips present.
    20. present: Guidance pass 20: avoid area, report, or safety tips present.
    21. present: Guidance pass 21: avoid area, report, or safety tips present.
    22. present: Guidance pass 22: avoid area, report, or safety tips present.
    23. present: Guidance pass 23: avoid area, report, or safety tips present.
    24. present: Guidance pass 24: avoid area, report, or safety tips present.
    25. present: Guidance pass 25: avoid area, report, or safety tips present.
  • Timepresent25/25

    Final assessment

    All 25 reads agree t is present in this DPSS notice.

    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. present: Time pass 1: 2019-03-16 / timestamps in notice.
    2. present: Time pass 2: 2019-03-16 / timestamps in notice.
    3. present: Time pass 3: 2019-03-16 / timestamps in notice.
    4. present: Time pass 4: 2019-03-16 / timestamps in notice.
    5. present: Time pass 5: 2019-03-16 / timestamps in notice.
    6. present: Time pass 6: 2019-03-16 / timestamps in notice.
    7. present: Time pass 7: 2019-03-16 / timestamps in notice.
    8. present: Time pass 8: 2019-03-16 / timestamps in notice.
    9. present: Time pass 9: 2019-03-16 / timestamps in notice.
    10. present: Time pass 10: 2019-03-16 / timestamps in notice.
    11. present: Time pass 11: 2019-03-16 / timestamps in notice.
    12. present: Time pass 12: 2019-03-16 / timestamps in notice.
    13. present: Time pass 13: 2019-03-16 / timestamps in notice.
    14. present: Time pass 14: 2019-03-16 / timestamps in notice.
    15. present: Time pass 15: 2019-03-16 / timestamps in notice.
    16. present: Time pass 16: 2019-03-16 / timestamps in notice.
    17. present: Time pass 17: 2019-03-16 / timestamps in notice.
    18. present: Time pass 18: 2019-03-16 / timestamps in notice.
    19. present: Time pass 19: 2019-03-16 / timestamps in notice.
    20. present: Time pass 20: 2019-03-16 / timestamps in notice.
    21. present: Time pass 21: 2019-03-16 / timestamps in notice.
    22. present: Time pass 22: 2019-03-16 / timestamps in notice.
    23. present: Time pass 23: 2019-03-16 / timestamps in notice.
    24. present: Time pass 24: 2019-03-16 / timestamps in notice.
    25. present: Time pass 25: 2019-03-16 / timestamps in notice.
  • Impactpresent25/25

    Final assessment

    All 25 reads agree i is present in this DPSS notice.

    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. present: Impact pass 1: realized or alleged incident outcome narrated.
    2. present: Impact pass 2: realized or alleged incident outcome narrated.
    3. present: Impact pass 3: realized or alleged incident outcome narrated.
    4. present: Impact pass 4: realized or alleged incident outcome narrated.
    5. present: Impact pass 5: realized or alleged incident outcome narrated.
    6. present: Impact pass 6: realized or alleged incident outcome narrated.
    7. present: Impact pass 7: realized or alleged incident outcome narrated.
    8. present: Impact pass 8: realized or alleged incident outcome narrated.
    9. present: Impact pass 9: realized or alleged incident outcome narrated.
    10. present: Impact pass 10: realized or alleged incident outcome narrated.
    11. present: Impact pass 11: realized or alleged incident outcome narrated.
    12. present: Impact pass 12: realized or alleged incident outcome narrated.
    13. present: Impact pass 13: realized or alleged incident outcome narrated.
    14. present: Impact pass 14: realized or alleged incident outcome narrated.
    15. present: Impact pass 15: realized or alleged incident outcome narrated.
    16. present: Impact pass 16: realized or alleged incident outcome narrated.
    17. present: Impact pass 17: realized or alleged incident outcome narrated.
    18. present: Impact pass 18: realized or alleged incident outcome narrated.
    19. present: Impact pass 19: realized or alleged incident outcome narrated.
    20. present: Impact pass 20: realized or alleged incident outcome narrated.
    21. present: Impact pass 21: realized or alleged incident outcome narrated.
    22. present: Impact pass 22: realized or alleged incident outcome narrated.
    23. present: Impact pass 23: realized or alleged incident outcome narrated.
    24. present: Impact pass 24: realized or alleged incident outcome narrated.
    25. present: Impact pass 25: realized or alleged incident outcome narrated.

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

About this analysis
Context

Background

University of Michigan DPSS news.dpss.umich.edu official notice archive.
Analysis

Key Findings

Official DPSS notice provides full transmitted alert or security bulletin text.
Outcome
See official DPSS notice for investigation status and community guidance.
Provenance

Sources

Every claim on this page is meant to be checkable. Open the links below (and the Verify this quote control under each confirmed alert) to read the original university, news, or archive page yourself. Hostnames are shown so you can see where you are going; archived copies survive when live pages move or disappear. See also our methodology.

  1. Official
    UM EMERGENCY ALERT – ALL CLEAR
    news.dpss.umich.edu
    archived copy
Cite this case

Campus Alert Archive. "University of Michigan: All clear after Mason Hall unconfirmed active shooter report." Incident of March 16, 2019. Added July 2026. https://campusalertarchive.com/case/university-of-michigan-mason-hall-active-shooter-all-clear-2019-03-16/

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

Tags
michigandpssswattingemergency-alertHoax
Added July 2026Updated July 2026Via ingestion