Lee Rigby murder: How two men became killers
19 December 2013 Last updated at 23:08 GMT
Michael Adebolajo and Michael Adebowale have been found guilty of the murder of soldier Lee Rigby in Woolwich in May.
Panorama's Peter Taylor has been looking at the background of the two killers who were raised as Christians.
He spoke to Omar Bakri, the Islamist militant who is responsible for radicalising at least one them.