FedEx truck carrying training grenades catches fire on I. 76. Reported by Amanda Garrett. A Fed X truck carrying ammunition, grenades and the potentially explosive chemical sodium hydroxide caught fire Wednesday night in Edinburg Township in Portage County. No one was injured, but five local and state agencies scrambled to shut Interstate 76 in both directions between about 10:30 p.m. Wednesday and 2:30 a.m. Thursday, according to the Ravenna post of the State Highway Patrol.