Teenager Hasib Hussain was known as a quiet student with few friends whose life attracted little outside attention during his early teens.
Hasib Hussain became devoutly religious after a trip to Pakistan
Hussain, like two of the other bombers, Mohammad Sidique Khan and Shehzad Tanweer, was a second generation British citizen whose parents were of Pakistani origin.
He grew up in a street called Colenso Mount in Holbeck, on the outskirts of Leeds.
The youngest of four children, he was still living with his parents when he died.
In the aftermath of the London bombings, newspapers reported how he would start fights with fellow pupils at the Matthew Murray Secondary School in Leeds.
But background information compiled in the official report into the London bombings show Hussain lived a very ordinary life.
Big for his age, he is remembered at school as a quiet student with few friends.
He was not a high achiever academically, and although he liked sports, he was never outstanding.
He was involved in a brief period of racial tension at the school, but was not a known troublemaker.
Hussain left school in July 2003 with seven GCSEs and went on to study an advanced business course which he finished a month before the bombings.
One neighbour described the family as "very nice people".
"We all knew them but I wouldn't say I knew them well. They were just a very nice family," he said.
'Al Qaeda - No limits'
A year before leaving school, Hussain went to Mecca to do the Hajj pilgrimage and went to Pakistan to visit relatives.
On his return to the UK he was noticeably more religiously observant - he grew a beard and began to wear robes.
Hussain was born in Leeds in September 1986
Not long after his return from the pilgrimage, someone noticed he had written 'Al Qaeda - No Limits' on his religious education school book.
He would speak openly of his support for the radical movement and said he believed the 11 September bombers were "martyrs".
He also told teachers he wanted to become a cleric when he left school.
1986: Born in W Yorks
2002: Hajj visit to Mecca, visits family in Pakistan
2004: Police caution for shoplifting
7 July 2005: Bombs bus in Tavistock Square, killing 13
Source: UK government
Despite his new-found piety, he was cautioned for shoplifting during 2004.
Much of his social life was based around the local mosques, youth clubs and the gym in the neighbouring district of Beeston, where fellow bombers Khan and Tanweer grew up.
It was through the youth clubs that Hussain became close to both men.
In 2004, Hussain suddenly stopped dressing in traditional robes and began wearing western clothes.
'Just visiting friends'
Apparently well-integrated into British society, Hussain had told his family he was going on a trip to London to visit friends in July 2005.
But when he failed to return, his parents reported him as missing to police.
He had in fact boarded the No 30 bus in London armed with enough explosives to rip the double-decker apart, killing 13 people. His driving licence and cash cards were found in the mangled wreckage of the bus.
His family later said they were "devastated" by what had happened.
In a statement they described Hussain as "a loving and normal young man who gave us no concern".
"We are having difficulty taking this in," they said.
"Our thoughts are with all the bereaved families and we have to live ourselves with the loss of our son in these difficult circumstances.
"We had no knowledge of his activities and, had we done, we would have done everything in our power to stop him. "