0126 hours - Still alarm – Engine 46 – Shoemaker & Cooper. Report of a vehicle fire. Central updated the location to the St Jean Terminal for DDOT (Detroit Dept of Transportation) Bay 54. Engine 46 on location with a bus going inside of a garage, requesting the box. Commercial Box Alarm – Shoemaker & Cooper at the DDOT terminal – Engines 9,50,58, Ladders 6,23, Chiefs 1,9, Squads 2,3. Chief 9 reporting a fire in the DDOT bus terminal, holding the commercial box. Chief 9 advised multiple busses on fire inside the terminal. Chief 9 reporting an explosion requesting the 2nd alarm at 0149 hours. 2nd alarm companies: Engines 17,9,60,32, Ladders 7,20, Squad 6, Car 203. Heavy fire throughout with collapse of 4 bays, everyone accounted for. Defensive operations, fire spread to a total of 6 bays, fire wall prevented further extension.