REYNOLDSVILLE, Pa. (AP) - Authorities are blaming a snow squall for a 21-car pileup that closed Interstate 80 in western Pennsylvania for about eight hours.

The eastbound lanes reopened late Monday night after crews cleaned up the crash involving six tractor-trailers and 15 other vehicles in Washington Township, Jefferson County.Seventeen people were reported injured. State police say several of those injured were in serious condition.Jefferson County Emergency Management Director Tracy Zents tells WJAC-TV a tanker carrying liquid nitrogen was involved in the crash but no spill occurred.Emergency officials reported a number of other, smaller weather-related crashes.