BREEZEWOOD, Pa. (AP) _ A bus struck a jackknifed tractor-trailer early Friday on a foggy, mountainous stretch of Interstate 70, slid down an embankment, and injured at least 17 people, none seriously, authorities said.

The Trailways bus was carrying 18 passengers when the accident occurred just before 4:30 a.m. about nine miles south of Breezewood, said state police trooper Harold Smith.

The bus left Washington, D.C., after midnight and was due to arrive in Pittsburgh around 7 a.m., said Trailways District Manager Terry Schiefer. It was then scheduled to go on to Los Angeles.

''There were no serious injuries,'' said Viola Boehm, assistant district manager for Trailways.

The accident occurred on a mountain known as Town Hill in Fulton County, according to Smith.

Rose Hendershot, who lives about a quarter-mile from the accident scene, said witnesses told her the rig jackknifed and the bus ran into the truck. The bus then slid down an embankment and came to rest on its side against a tree.