OHIO TOWNSHIP, Pa. – (WPXI) – Two people were killed in a fiery head-on crash on Interstate 79 early Thursday. The crash happened in a construction zone between the Mount Nebo Road and Emsworth/Sewickley exits around 12:20 a.m. Three vehicles were involved, according to state police. A tractor-trailer traveling south crossed the median and struck a vehicle head-on, pushing both vehicles into an embankment. The trailer of the truck struck a second vehicle traveling northbound. Both vehicles involved in the head-on collision became fully engulfed in flames and both drivers were pronounced dead at the scene. The other occupants were treated and taken to local hospitals. The extent of their injuries was not released. Both directions of I-79 were closed for hours. (Photo: WPXI)