Two truck drivers were killed Monday in a 5-vehicle collision on a dangerous stretch of road near Pleasantville, Pa., authorities said. Police said the 40-year-old tractor-trailer driver was hauling tubs of ice cream eastbound down the mountain when he hit the back of a car. The truck fell on its side, slamming into the tanker head-on, authorities said.

The tanker, driven by a 41-year-old man, was carrying refrigerated liquid carbon dioxide. The first truck then hit two more cars that were driving westbound behind the tanker. Authorities said that the driver of the first car suffered major injuries, and the driver of one of the cars following the tanker sustained moderate injuries, but no one in the other car that was hit sustained injuries. It was not made clear if the accident was the result of driver error.