British anti-terrorist police released a new image of one of the July 7 suicide bombers today which showed the man walking through a London train station shortly before he set off a bomb on a bus.
Hasib Hussain, 18, was captured on surveillance cameras walking through the main concourse of King's Cross train station at 9 a.m. carrying the rucksack with the bomb he detonated 45 minutes later on a double decker bus killing 13 people.
His accomplices, three other British men, exploded devices on London underground trains in coordinated attacks shortly before 9 a.m. killing 39 other commuters.
Police said they hoped the new image of Hussain would throw some light on his movements on the day of the attacks.
"We are always looking for evidential opportunities. We cannot discount anything," said Andy Hayman, Assistant Commissioner of London police.
"We would ask the public to think if this photograph triggers off anything they may remember."
Detectives suspect that Hussain had also intended to target an underground train but changed his plans when the line he wanted to use was shut.
After making a number of phone calls to the other bombers, he is thought to have headed towards Euston train station and may have boarded another bus, before finally getting on a Number 30 bus where the bomb was detonated.
Two weeks ago police released surveillance footage which showed three of the bombers, but not Hussain, had carried out a dry run to London nine days before the attack.
Al Qaeda has claimed responsibility for the July 7 attacks, but detectives say it is still unclear whether the group had any international links.
Officers said they want to trace anyone who provided the bombers with logistical or financial support but as yet have made no arrests in connection with the attacks.