Campus Alert Archive
ISMMS

Off-Duty Officer Disarms Gunman in Mount Sinai ER: 22 Minutes That Reshaped Medical School Safety Talks

NYactive shooteremergency notificationmedium confidence
Confirmed Threat

On the evening of November 13, 2025, 20-year-old Elijah Brown walked into the Mount Sinai Hospital emergency room on Manhattan's Upper East Side after telling a bodega clerk to call 911 because he was going to 'shoot it up.' Brown was encountered by an off-duty NYPD officer working a security detail in the ER and was escorted out. He was fatally shot moments later by responding 19th Precinct officers on Madison Avenue between East 95th and 96th streets after he raised his weapon and fired at least one round. The hospital — primary teaching site for the Icahn School of Medicine — entered a brief internal lockdown.

Alerts
3
Response
1 min
Killed
1
Injured
0
Institution
Icahn School of Medicine at Mount Sinai
Private R1 · NY
~1,700 studentsInternal overhead announcement + system pageMount Sinai Emergency Notification (Code Silver)
Confirmed Timeline

Alert Sequence

3 messages in sequence

Some alert texts below are approximate reconstructions from news coverage, not confirmed verbatim transcripts. Reconstructed texts are shown in italic with a dashed border. Verified verbatim texts have a solid border and are marked accordingly.

INITIAL ALERTPA System
Approximate reconstructionReconstructed from CBS New York and ABC7 timeline; standard Mount Sinai overhead-page format104 chars
Code Silver, Emergency Department. Code Silver, Emergency Department. Code Silver, Emergency Department.

This text has been reconstructed from news coverage and may not reflect the exact original wording.

Reconstructed in the standard three-repeat hospital Code Silver format; CBS New York placed Brown's brief entry into Mount Sinai Medical Center at approximately 7:08 PM EST on November 13, 2025
Mount Sinai's Code Silver is the internal designation for an armed assailant in the building; it triggers a unit-level lockdown rather than a public-facing Clery alert because Mount Sinai Hospital is a clinical facility, not a residential campus
An off-duty NYPD officer working a paid security detail in the ER first encountered Brown and a brief struggle ensued before Brown was escorted back outside, where he picked up a firearm he had left at the base of a tree
UPDATEPA System
Approximate reconstruction141 chars
Code Silver update: Suspect is outside the building. Police engaged. Maintain shelter in place. Do not exit through Madison Avenue entrances.

This text has been reconstructed from news coverage and may not reflect the exact original wording.

Reconstructed from [nurse accounts published by The CITY](https://www.thecity.nyc/2025/12/04/mount-sinai-shooting-nurses-nysna/) describing the response as 'chaotic' with 'several minutes' of uncertainty about whether the shooter was inside or outside the hospital
Responding officers fired more than 20 rounds at Brown on Madison Avenue between East 95th and 96th streets after he raised his weapon and fired at least one shot
Brown was returned to the same Mount Sinai ER he had just threatened and was treated there before dying of his wounds
ALL CLEARPA System
Approximate reconstruction114 chars
Code Silver, all clear. The suspect is no longer a threat. Police investigation ongoing. Resume normal operations.

This text has been reconstructed from news coverage and may not reflect the exact original wording.

Reconstructed from the [NYSNA statement](https://www.nysna.org/press/nysna-statement-response-active-shooter-incident-mount-sinai-hospital), which acknowledged that the active threat ended quickly but criticized Mount Sinai's handling of staff safety
Mount Sinai later issued [final written warnings to two nurses and suspended a third](https://www.thecity.nyc/2025/12/04/mount-sinai-shooting-nurses-nysna/) the day after Thanksgiving 2025 for speaking publicly about safety conditions in the ED following the shooting
The Icahn School of Medicine at Mount Sinai shares the Annenberg Building campus block with the hospital; medical students rotating through the ED were among those sheltered in place
Context

Background

On the evening of November 13, 2025, 20-year-old Elijah Brown threatened multiple people across Manhattan's Upper East Side before walking into Mount Sinai Hospital's emergency room at approximately 7:08 PM EST. Brown had pulled a gun on a neighbor in an elevator at 1590 Madison Avenue and had demanded that a bodega clerk on East 107th Street 'call 911' because he was going to 'shoot up' the hospital. An off-duty NYPD officer working security inside the ER confronted Brown, who eventually exited the building and retrieved a firearm he had left at the base of a tree. Responding officers from the 19th Precinct shot and killed Brown on Madison Avenue between East 95th and 96th streets after he raised his weapon and fired at least one round. The hospital — which serves as the primary teaching hospital for the Icahn School of Medicine at Mount Sinai — entered a Code Silver internal lockdown that lasted roughly an hour. The New York State Nurses Association immediately called for metal detectors and additional security staffing. Mount Sinai subsequently disciplined three nurses who spoke publicly about ED safety after the incident, drawing accusations of retaliation from the union. The case illustrates a recurring pattern in academic medical centers: clinical hospitals use internal color codes rather than Clery-style emergency notifications, leaving medical students rotating in the ED to rely on hospital channels rather than university alert systems.
Analysis

Key Findings

Mount Sinai relied on internal Code Silver overhead pages rather than the university-style SMS/email alerts used by most academic campuses, even though Icahn School of Medicine students were among those sheltered in place
An off-duty NYPD officer working a paid security detail was the key intervenor; Mount Sinai's permanent unarmed security force did not engage the gunman directly
The post-incident discipline of three nurses for speaking out about safety conditions drew national attention to the gap between hospital risk-management protocols and traditional Clery Act emergency-notification expectations
Outcome
Brown died of his gunshot wounds in the same Mount Sinai ER he had threatened. No officers, staff, students, or patients were physically injured. The [New York State Nurses Association issued a statement](https://www.nysna.org/press/nysna-statement-response-active-shooter-incident-mount-sinai-hospital) demanding metal detectors and more security; Mount Sinai later disciplined three nurses who spoke publicly about the incident, drawing union protests.
Provenance

Sources

  1. News
    Video shows deadly Upper East Side shootout with police (CBS New York)
    cbsnews.com
  2. News
    NYPD shoot and kill armed man who allegedly opened fire (ABC7 New York)
    abc7ny.com
  3. News
    Police kill armed man who threatened to 'shoot up' hospital (Fox 5 NY)
    fox5ny.com
  4. News
    Three Nurses Disciplined After Speaking Out (The CITY)
    thecity.nyc
  5. Source
    NYSNA Statement in Response to Active Shooter Incident at Mount Sinai
    nysna.org
  6. Official
    Icahn School of Medicine Division of EMS and Disaster Preparedness
    icahn.mssm.edu
  7. Source
    3 Nurses Disciplined After Attempted Hospital Shooting (Nurse.org)
    nurse.org
Tags
code-silveractive-shootermedical-schoolacademic-medical-centermanhattanoff-duty-officerhospital-violencenyu-icahnlabor-disputenursing-union
Added May 2026Updated May 2026Via ingestion