( Fairfield Twp ) - Members of the Butler County Sheriff's BURN Taskforce ended up calling in a lot of backup Friday at a home on Ravena Drive.

They were initially there as part of a drug investigation, but as they searched the home, they say they found a collection of suspicious chemicals. That led to haz-mat teams, FBI and ATF agents, and members of Homeland Security all coming to that hosue.

35 homes all around the area were evacuated as a precaution, and those affected were allowed to return to their homes in the early evening.

There are unconfirmed reports of arrests, though none of the chemicals in question have been identified yet.