Profile of the London bombers: A fatal association

Today, as London prepares to stage a two-minute silence in memory of the victims, the story of how the group of friends from Leeds abandoned their lives of anonymity to become Britain's most notorious terrorists is coming to light.

Four young British men of Pakistani origin travelled from Yorkshire to London and calmly carried out the first suicide attacks in Britain. In rucksacks they carried a deadly cargo - explosives which brought terror to London and claimed more than 50 lives.

Suspect 4 - Identity not established