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Firefighters were called to the Detroit Department of Transportation (DDOT) bus terminal on Detroit’s east side. The explosion caused the roof to collapse as fire engulfed the building in the early hours. Dozens of firefighters battled the blaze, which is thought to have started in the engine of a parked bus.

Several explosions were heard as the building collapsed

It is believed 20 buses were parked in the garage when the fire started. Authorities are investigating the fire which caused travel chaos for commuters during rush hour with many bus routes experiencing delays. Laura Bonnell, a journalist for WWJ Newsradio, said one of the bus bays collapsed in the fire.

TWITTER Fire engulfed the building following a loud explosion

TWITTER The explosion caused the roof to collapse

She said several explosions had been heard at the terminal. It was not known if there were injuries. Fire officials were not immediately available for comment. DDOT said in a statement: "There was a fire early this morning around 1.30 am at the DDOT Shoemaker Terminal on St. Jean Street on the City's Eastside.

TWITTER Dozens of firefighters battled the blaze