A bus carrying 42 passengers traveling from Harvard University in Cambridge, Massachusetts, to Pennsylvania crashed into a Boston overpass on Saturday night, injuring 34 people, according to emergency officials. The crash happened about 7:30 p.m. EST on Soldiers Field Road in Boston, according to Boston Emergency Medical Services spokeswoman Jennifer Mehigan. Medical workers transported 34 people to four area hospitals - 30 with minor injuries, three serious, and one life-threatening, Mehigan said. Some people had to be removed through the bus roof, strapped onto backboards, according to the Boston Fire Department’s Twitter feed.