Excerpt:
MI5 asked Woolwich murder suspect Michael Adebolajo if he wanted to work for them about six months before the killing, a childhood friend has said.
Abu Nusaybah told BBC Newsnight his friend - one of two men arrested after Drummer Lee Rigby's murder in south-east London on Wednesday - had rejected the approach from the security service.
The BBC could not obtain any confirmation from Whitehall sources.