The incident happened around 9:15 a.m. Wednesday when a Philadelphia police officer pulled over a vehicle with two men inside at the intersection of Germantown and Allegheny avenues.
The fire department tells Action News that one of the men dumped out a liquid from a container he had inside the vehicle outside the passenger side window. The fumes permeating from the spill made the officer nauseous, prompting a call for HAZMAT crews.
Officials say they don't know what the substance is, but it appears to be some sort of industrial solvent.
Police believe the men may have been huffing the substance. No charges have been filed as of yet.
The officer was transported to the hospital to be checked out, but is said to be fine.