A crash involving a school bus in Boston on Thursday afternoon sent four people, all adults, to the hospital, officials said. WATCH HERE WATCH HEREThe Boston Fire Department said all four people who were injured are adults. Fire companies responded to a school bus accident just off Cummins Highway and Harvard Sts in Hyde Park. "When you come up Harvard Street, it's a blind spot, cause you're coming up a hill," said neighbor Jessica Bolt. Aerial images showed a school bus on its side, with the rear emergency door open and police and firefighters around it.