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At least 36 people have been injured in Boston after a charter bus carrying 42 passengers struck a low bridge. Firemen at the scene tried to free several passengers who became trapped, with some feared to be in a critical condition.

Four passengers had to be cut free, CBS Boston reported. They were taken to local hospitals with serious injuries.

Boston Emergency Medical Services says that 36 people were injured overall, with one being hospitalized with life-threatening injuries.

Three others were seriously injured.

Twenty eight passengers suffered minor injuries and were waiting at the scene of the crash to be transported to hospitals.

The private Calvary Coach bus was heading from Harvard University to Pennsylvania with 42 passengers on board when it struck the Western Ave. Bridge in Boston.

More photos here.