A shuttle bus inexplicably rolled down a hill and overran a ledge near the Acheson Science Building at the Mount Vernon Campus Tuesday night. No injuries were reported from the accident, which was the second involving an MVC shuttle bus in the last week.

The bus, which contained four students and a driver, crashed through a railing and went over a 10-foot wall at about 9 p.m., University officials said. The shuttle’s back wheels were suspended in the air before city officials pulled it away from the wall.

Three students and the driver were “a little shaken up” by the accident and taken to nearby Georgetown University Hospital for an evaluation, said Tracy Schario, director of Media Relations, who was at the scene of the accident. No one suffered any injuries, she added.

D.C. Fire Department Battalion Chief Al Jeffrey said that the accident was caused by driver error, calling the wreck “a big oops.” He declined to identify the driver.

Schario said International Limousine Company, which operates the Mount Vernon shuttles, completed its investigation Wednesday and attributed the crash to driver error. She said the company fired the driver.

Firefighters told a crowd of students to back away from the accident scene as they attempted to find the valve for the gas main leading into the science building, fearing that if the shuttle moved, it could rupture the conduit. They succeeded in safely removing the bus.

On Aug. 31, a fire erupted on an empty shuttle bus, ravaging its interior and leaving only its metal frame intact. International Limousine officials are still investigating that accident, which caused no injuries.

–Michael Barnett contributed to this report.