A commuter bus in Stockholm, Sweden exploded when it hit a barrier on Sunday.
The bus was heading towards a tunnel in the center of the city when it hit a barrier restricting tall vehicles from entering the tunnel. The bus, which runs on natural gas, hit the top of the barrier where its fuel tank is located.
The bus was apparently not in service at the time. There were no passengers on the bus except for the driver who was taken to a hospital.
The enormous explosion and plume of black smoke worried people that a possible terror attack had taken place, but the incident was merely an accident.
The fire took about a half hour to extinguish.