Federal authorities are still removing weakened walls and barrels of hazardous waste from an industrial warehouse that burned in Cincinnati. The Queen City Barrel Company warehouse caught fire and burned on August 19th. Officials estimated the damage at five million dollars. The fire's cause hasn't been determined. Arson investigators haven't been allowed into the ruins because authorities were concerned that burned walls might collapse and barrels of toxic waste still remained in the wreckage. The US Environmental Protection Authority is overseeing the waste cleanup. Officials say it could be at least three more weeks before arson investigators can get in to do their work.