Seven people were slightly injured Thursday night when an MBTA bus and another vehicle collided in Roxbury, officials said. The left bumper of the Route 28 bus collided with another vehicle as the bus pulled out of a stop at Warren and Gaston streets around 7:45 p.m., said Joe Pesaturo, a spokesman for the MBTA. Seven people, all from the bus, were taken to Boston Medical Center and Brigham and Women’s Hospital for back and arm discomfort, Pesaturo said. The cause of the crash is under investigation, and it was not immediately clear if any charges were filed.

Derek J. Anderson can be reached at derek.anderson@globe.com.