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UMD

Nitric acid spill triggers a lab explosion; three connected buildings evacuated

AI-generated · every claim is source-linked
MNhazmatemergency notificationmedium confidence
Confirmed Threat

At 9:20 AM CDT on September 12, 2024, a graduate student spilled nitric acid in a basement lab in Voss-Kovach Hall at the University of Minnesota Duluth, triggering a small chemical explosion. UMD pushed a SAFE-U emergency alert at 9:58 AM CDT ordering Voss-Kovach Hall evacuated, followed by a second alert evacuating the connected Engineering and Endazhi gikinoo'amaading buildings because they share a ventilation system. The graduate student was taken to the hospital with minor injuries, and all three buildings were declared safe and reopened at 3:53 PM CDT.

Alerts
3
Response
—
Killed
0
Injured
1
Institution
University of Minnesota Duluth
Public R2 · MN
All UMD cases →
~11,500 studentsSAFE-U
Documented Timeline

Alert Sequence

3 messages in sequence · 1 verified verbatim

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UPDATESMS
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ALL CLEARSMS+5h 55m
Verified verbatim181 chars
UMD SAFE-U Alert: Effective immediately, building evacuations are lifted and all campus buildings are open and safe to enter. Check the SAFE-U email for more information. (Alert #4)
Verbatim text from the official University of Minnesota Duluth Facebook page, which posted this SAFE-U Alert as Alert #4, the all-clear issued at approximately 3:53 PM CDT
The actual text says 'all campus buildings' rather than naming Voss-Kovach Hall, the Engineering Building, and Endazhi gikinoo'amaading individually, a broader-scope all-clear than the individual-building evacuation alerts
The unusually long evacuation duration reflects the complexity of clearing nitric acid vapors from a multi-building shared-ventilation system
Context

Background

The University of Minnesota Duluth is a public R2 doctoral university with about 11,500 students. On Thursday morning, September 12, 2024, at approximately 9:20 AM CDT, a graduate student in a basement chemistry lab in Voss-Kovach Hall spilled nitric acid, causing a small chemical explosion. The student sustained minor injuries and was taken to the hospital. UMD pushed a SAFE-U alert at 9:58 AM CDT ordering Voss-Kovach Hall evacuated, then a second alert evacuating the connected Engineering Building and Endazhi gikinoo'amaading because they share a ventilation system with Voss-Kovach. Likely hundreds of people were evacuated since classes were in session. Duluth Fire's hazmat team responded and worked to ventilate the affected areas. UMD lifted all evacuations at 3:53 PM CDT, about 6.5 hours after the explosion. UMD officials announced an investigation into the incident, which was contained to a small section of one lab.
Analysis

Key Findings

The first alert came 38 minutes after the explosion, longer than most active-threat alerts, reflecting the added steps of confirming chemical identity and ventilation contamination in a hazmat response
The decision to evacuate three connected buildings based on shared ventilation, before contamination was confirmed in the additional buildings, was a precautionary measure given the shared-ventilation risk
The 6.5-hour evacuation duration reflects the difficulty of clearing nitric acid vapors from a complex shared-ventilation system
Endazhi gikinoo'amaading is UMD's Indigenous academic center; its inclusion in the alert sequence reflects the integration of newer campus buildings into legacy ventilation systems
Outcome
One graduate student was transported to the hospital with minor injuries from the nitric acid explosion. UMD ordered three connected buildings (Voss-Kovach Hall, Engineering, and Endazhi gikinoo'amaading) evacuated due to a shared ventilation system. Hundreds of students, faculty, and staff were displaced during ongoing classes. Hazmat crews from Duluth Fire and the University responded; buildings were cleared and reopened at 3:53 PM CDT.
Provenance

Sources

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Cite this case

Campus Alert Archive. "University of Minnesota Duluth: Nitric acid spill triggers a lab explosion; three connected buildings evacuated." Incident of September 12, 2024. Added May 2026; last updated August 2026. https://campusalertarchive.com/case/university-of-minnesota-duluth-chemical-explosion-2024-09-12/

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

Tags
hazmatchemical-spilllab-explosionminnesotapublic-r2evacuationshared-ventilationnitric-acid
Added May 2026Updated August 2026Via ingestion