It looks like someone was doing a little experiment in the lab.

ABC News in Philadelphia reported.

Hazmat Crews Respond To Strong Odor On Temple University Campus

Philadelphia Hazmat crews responded to Temple University late Wednesday night after a strong odor was reported.

It happened around 11:30 p.m. at the Beury Science Hall building, located on the 1900 block of North 13th Street.

According to police, A graduate student was conducting an experiment that caused a leaking substance with a strong odor.

Licenses and Inspections and the Health Department were also contacted.

Ten overnight employees were evacuated as a precaution.

Crews ventilated the building, and the incident was placed under control within a half hour.