Thirty-four people were injured late Saturday when a charter bus traveling on a highway hit an overpass in Boston, Massachusetts, US media reported.
NBC News said the accident happened on Soldiers Field Road about 7:30 pm (0030 GMT Sunday).
The bus was returning to Pennsylvania from Harvard University with 42 people on board, the network said.
The injured have been taken to local hospitals. One them is reported to have life-threatening injuries.