CLAIRTON, Pa. (AP) — The Latest on a fire at U.S. Steel coke plant (all times local): 5:50 p.m. Health authorities are threatening to shut down U.S. Steel's suburban Pittsburgh coke plant unless it comes into compliance with air emissions standards. The Allegheny County Health Department issued an emergency order Monday after a fire at the steel producer's coke works in Clairton knocked out equipment used to remove toxic gases. Health officials say U.S.