Several fire departments were called in to help during a hazmat situation when smoke and vapor cloud formed at a manufacturing facility Thursday night.
The Hamden Fire Department was among those who provided mutual aid.
Hamden said their hazmat technicians assembled a decontamination line at the scene.
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The Connecticut Department of Energy and Environmental Protection (DEEP) also responded.
They said some floric acid had spilled the previous night, it was packaged up in a drum and the chemicals in the drum became contaminated.
A heat reaction caused the drum of material to melt, which created a cloud of smoke and vapor in the building, according to DEEP.
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The drum of chemicals extinguished itself.
Clean Harbors, Inc. was brought in to help with cleaning up.
No injuries were reported.
