A bus was engulfed in flames during rush hour at Edgware station.
A bus on the 142 route caught fire after dropping passengers off at around 6pm yesterday, sparking fears there had been an explosion.
Smoke billowed through the station as police ushered passers-by away.
It took fire crews around two hours to contain the fire.
There were no injuries during the incident and the fire is believed to have started after a mechanical fault.