Raised in Beeston, Leeds, he was the youngest of six children born to Pakistani immigrants who had taken British citizenship.

Friends from his teenage years recall a highly Westernised young man who insisted on being called "Sid".

Khan was known to the MI5, but officers assigned to investigate him were diverted to another operation.

Following the attacks a video message recorded by Khan emerged in which he said he was a "soldier" at "war".

His bomb, detonated on a westbound Circle Line train, killed seven people.

Full profile of Mohammad Sidique Khan

Neighbours described the sports science graduate as a "nice lad" who could "get on with anyone". Friends said he was very religious, but did not express an interest in politics.

In 2004 he travelled to the Pakistani city of Karachi along with Khan.

The two became known to the security services, but were on the periphery of other surveillance operations.

Tanweer detonated his bomb on the eastbound Circle line, killing seven others.

Full profile of Shehzad Tanweer

He converted to Islam in 2000, took the name Jamal and, at around the same time, started to associate with troublemakers.

At school he was disciplined for handing out leaflets in support of al-Qaeda.

In many ways Lindsay's life was unsettled, but in 2002 he married a white convert to Islam, with whom he had a young boy. A daughter was born after his death.

Lindsay carried out the most deadly of the bombings, killing 26 on the Piccadilly line train.

Full profile of Germaine Lindsay

Hussain was a second generation British citizen whose parents were of Pakistani origin. He grew up in Holbeck, on the outskirts of Leeds, and was the youngest of four children. He was still living with his parents when he died.

While still at school, he went on the Hajj pilgrimage to Mecca.

His family said they were "devastated" to learn he was the bus bomber who claimed 13 lives on 7 July.

Full profile of Hasib Mir Hussain