Dramatic film of a fireman confronting one of the alleged July 21 bombers on a Tube train as other passengers fled in panic was shown to a jury yesterday.

The CCTV footage showed Ramzi Mohammed, 25, wearing a rucksack and boarding the busy Northern Line Tube at Stockwell, south London. He turned his back towards a mother with a child in a pushchair before detonating his device. The detonator exploded, although the main charge, made up of liquid hydrogen peroxide and chapati flour, failed to go off.

As other passengers tried to run, Angus Campbell, an off-duty fireman, stayed and challenged Mohammed as the train continued to Oval station, Woolwich Crown Court heard. The grainy footage showed the pair in the carriage at 12.26pm.