ASSOCIATED PRESS This image taken from video provided by WJLA shows a bus after crashing along I-270 in Bethesda, Md., Wednesday, Sept. 29, 2010. Maryland State Police say the commuter bus plunged off a highway outside the nation's capital.

ASSOCIATED PRESS This image taken from video provided by WJLA shows a bus after crashing along I-270 in Bethesda, Md., Wednesday, Sept. 29, 2010. Maryland State Police say the commuter bus plunged off a highway outside the nation's capital.