After a visit to Harvard University, dozens in a group of high school students and their adult chaperones were injured when their charter bus hit a bridge after police say the driver failed to heed low-clearance warning signs.
One person was hospitalized with life-threatening injuries and three with serious injuries, the Boston Emergency Medical Services said. Thirty-four people were injured in all, EMS said.
The Calvary Coach bus was carrying 42 people and was heading back to the Philadelphia area when it struck an overpass on Soldier's Field Road in Boston, a major crosstown road, at around 7:30 p.m. Saturday, Massachusetts State Police said. Some passengers were trapped for more than an hour as rescue crews worked to free them.
Massachusetts police say Samuel J. Jackson, who is 66, was driving the bus Saturday night.
Ray Talmedge, owner of the Philadelphia-based Calvary Coach Bus company, told WCAU-TV that Jackson looked down at his GPS and saw the bridge too late.
Police say no charges have been filed. A phone number listed for Jackson rang unanswered Sunday. The investigation will determine if he faces more serious charges, state police said. The driver was not injured.
Authorities said the bus did not belong on the road, where a 10-foot height limit is in place and over-sized vehicles are not authorized. State Police said the driver, "failed to heed signs" warning of the height limit and will likely be cited for an over-height violation.
CBS Station WBZ Boston reported that the bus company has an adequate record with the Department of Transportation.
The students were part of a Destined for a Dream Foundation group, Talmedge said. Officials with the Bristol, Pa.-based group, a nonprofit that helps underprivileged youth, refused to comment on the crash when reached by phone.
The group's Facebook page said the trip to Harvard was to "visit the campus, sit with the office of cultural advancement, followed by a tour of the campus ... followed by Harvard Square (shopping, eating, site seeing...etc...) This should be a fun time for all!"
None of those injured was identified, and state police said they did not know how many of the injured were adults and how many were juveniles.
The bus suffered significant damage in the crash. The front part of the roof was pushed in while the center section bowed downward. Photos posted on the Fire Department's website showed firefighters standing on the top of the bus using boards to extract people. The last victim was freed from the bus around 9 p.m., according to the department.
The Massachusetts Bay Transportation Authority sent buses to pick up other passengers and get them out of the frigid temperatures.
Soldiers Field Road curves along the Charles River and passes by Harvard and Boston University. It is a major roadway to the Massachusetts Turnpike. Soldiers Field remained closed while crews tried to remove the bus.
© 2013 CBS Interactive Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.