Dina Rudick/Globe Staff

The Calvary Coach bus involved in the crash on Soldiers Field Road.

Dina Rudick/Globe Staff

The bus was towed to a service center in Arlington.

Dina Rudick/Globe Staff

Raymond Talmadge, owner of Calvary Coach, told a television station that Jackson may have been checking his GPS at the time of the crash.

Dina Rudick/Globe Staff

By morning, the crash site was cleared.

Matthew J. Lee/globe staff

Emergency responders worked to free people trapped on the bus.

Matthew J. Lee/globe staff

The bus carried students and chaperones from Pennsylvania who had toured Harvard.

matthew j. lee/globe staff

At least 34 people were injured, including one with life-threatening injuries and three with serious injuries.