BETHESDA, Md. (AP) - Maryland State Police say a commuter bus plunged off a highway outside the nation's capital, killing one person and injuring several others.

State police spokesman Greg Shipley said parents and children were aboard the bus that fell 45 feet off a skyramp of the Washington beltway and landed below along Interstate 270 in Bethesda on Wednesday afternoon.

Montgomery County fire department spokesman Capt. Oscar Garcia says crews had to extricate four trapped people and that two have life-threatening injuries.

The severely damaged white bus, with green lettering reading "Wolf's," is sitting upright just over a jersey wall from a lane of I-270. Rescue workers have propped up ladders to reach inside the shattered windows. #####