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RADNOR, Pa. (AP) _ Two tour buses returning from a school camping trip collided Friday on a highway near Philadelphia. About 20 schoolchildren suffered minor injuries, officials said.

The accident closed southbound Interstate 476, backing up rush-hour traffic for more than five miles.

On the buses were children from Pittsgrove Middle School in New Jersey, who were returning home from the Poconos, school administrator W.R. Nelson said.

They suffered ``very minor injuries,'' said Leona Price, a state police spokeswoman.