UCLA building reopens after hazmat scare

LOS ANGELES - A laboratory vessel that exceeded its pressure threshold triggered the sprinkler system Tuesday morning at UCLA's Molecular Sciences Building, prompting an evacuation, according to the Los Angeles Fire Department.

What we know:

The incident happened in the microbiology building just after 6 a.m.

According to officials, an experiment was underway when the canister over-pressurized and released some type of gas, which then exploded and set off the sprinkler system. As a result, water began leaking from the fifth floor to the fourth floor. 

Initially, there were concerns about possible contamination of those gases because it's unknown what was in the glass tube, but the LAFD ruled that out. 

Crews inspected each floor and determined the water not to be contaminated.

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UCLA Fire and UCLA PD led the investigation.

The building was evacuated as a precaution while Charles E. Young Drive was closed outside the Molecular Sciences Building and campus buses were re-routed during the initial investigation.

Around 8 a.m., UCLA reported that the incident had been resolved and emergency crews were departing, and to expect residual traffic delays.

No injuries were reported and there was no significant damage to the building.