NewsRadio 920 WHJJ and the Associated Press

PAWTUCKET, R.I. (AP) — Pawtucket officials say at least 20 firefighters had to be decontaminated after possibly being exposed to an unknown chemical while fighting a blaze at a commercial building.

Firefighters were called to the corner of Fairland and Mineral Spring avenues at about 2 a.m. Tuesday on reports of explosions and a fire. Authorities remain on the scene.

Pawtucket Battalion Chief Robert Neill told WPRI-TV that fire crews came across a 55-gallon barrel containing an unknown chemical, and hazmat crews were called in to investigate.

Officials say at least 20 firefighters may have been exposed to the chemical, and one was brought to a hospital as a precaution.

The cause of the fire is under investigation.