JACKSONVILLE, Fla. AP – Five air traffic controllers are suing roofing contractors after they claim they lost their jobs after being unable to work because of toxic chemical exposure.

The five employees, Barbara Cooper, Shawn Fields, Dan Kersh, Joe Tingler and Tommy Young, claim they were fired when their doctors would not allow them to return to work in the radar room at Jacksonville International Airport’s control tower. They claim continued exposure to a toxic chemical used in a roofing project caused continuing medical problems.