A list of some of the deadliest bus accidents in U.S. history:
_ March 12, 2011: A bus returning to New York City from a casino overturned on a highway and was sliced in half by the support pole for a large sign, killing 14.
_ Sept. 23, 2005: A bus ferrying nursing home residents away from Hurricane Rita caught fire and exploded while stuck on a gridlocked highway south of Dallas, killing 23 people.
_ Oct. 9, 2004: A bus run by a mom-and-pop tour operator careened off an interstate in Marion, Ark., and overturned, killing 14 Chicago-area travelers on their way to a Mississippi casino and injuring 16.
_ May 9, 1999: A bus heading to a casino in Bay St. Louis, Miss., ran off a highway on Mother's Day, killing 22 people. Investigators said the driver was impaired by severe medical conditions and use of marijuana and an antihistamine.
_ Sept. 21, 1989: A school bus collided with a soft drink trunk and fell into a water-filled pit near Mission, Texas. Twenty-one students were killed and 60 injured.
_ May 14, 1988: A church bus returning from an amusement park collided head-on with a pickup near Carrollton, Ky., killing 24 children and three adults on the bus.
_ May 30, 1986: A speeding Starline Sightseeing Tours coach crashed in a California canyon, killing 21 passengers.
_ Feb. 18, 1981: A commuter bus crashed through a guardrail near Quantico, Va., and down an 80-foot embankment into a creek, killing 11 people and injuring 13.
_ June 5, 1980: A tour bus carrying mostly senior citizens from Dallas to Branson, Mo., plunged into a 40-foot ravine near Jasper, Ark., killing 20 people and injuring 13.
_ May 21, 1976: A bus carrying students from the Yuba City, Calif., High School choir plunged off a freeway ramp near Martinez, killing 28 students and a teacher in the deadliest bus accident in U.S. history.
_ Feb. 28, 1958: A bus carrying 48 elementary and high school students went off the road in Prestonburg, Ky., plunged down an embankment and into swollen river waters, where it was swept downstream and submerged, killing 27.