DRAMATIC footage of the moment one of the alleged July 21 bombers tried to detonate his rucksack bomb was revealed for the first time today.

Ramzi Mohammed is claimed to be the first man who tried to set off devices on London's transport system that day.

The CCTV pictures showed the 25-year-old boarding a busy Tube train with a rucksack, and turning with his back to a mother and her child before attempting to detonate the device.

Panic ensued as passengers tried to flee the scene. Only one man, firefighter Angus Campbell, stayed to try to remonstrate with the alleged attacker.

The driver of the Northern Line Tube train carried on until he reached an open platform. The jury watched in silence as the footage played out over a minute, showing Mohammed and Mr Campbell alone in the carriage.

At one point, Mohammed dropped the rucksack and pointed at it repeatedly.

Nigel Sweeney QC, prosecuting, said Mohammed denied to was a bomb and tried to offer an excuse as to what had taken place. He said: "He placed the rucksack on the floor, no doubt the best he could do, being surprised to find himself alive."

When the train pulled into Oval station and the doors finally opened, Mohammed fled.

Muktar Said Ibrahim, 28; Ramzi Mohammed, 25; Yassin Omar, 26; Hussain Osman, 28; Manfo Kwaku Asiedu, 33; and Adel Yahya, 24, all deny charges of conspiracy to murder and cause explosions.