A dangerous combination of chemicals is to blame for a fire that sent more than a dozen Cranston firefighters to the hospital. An employee at Prosys Finishing Technologies in Cranston was pouring chemicals together to dispose of them on Jan. 29. One of the chemicals didn't mix well with the others, which caused a fire and toxic spill on Elmwood Avenue. “It could've been a worse situation," said Paul Casey, director of EMS for Cranston. "We had a daycare right next door and that's going to lead to panicked parents coming down to get their kids when they see all the emergency lights there so the mass casualty part of it could have been worse."