On 15 March an IRA bomb exploded on a Metropolitan line train at West Ham station, on the Hammersmith & City section of the line. The bomber, Vincent Donnelly, possibly took the wrong train and attempted to return to his destination. However, the bomb detonated prior to reaching the City of London. Donnelly shot Peter Chalk, a Post Office engineer, and shot and killed the train's driver Julius Stephen, who had attempted to catch the perpetrator. Donnelly then shot himself, but survived and was apprehended by police.