A person who knew one of the three London Bridge terrorists has told how they called an anti-terrorist hotline about the murderer, who is also said to have featured in Channel 4 documentary, The Jihadis Next Door.
A BBC reporter said they had spoken to two people who said they had "warned police about one of the perpetrators" involved in Saturday's killing spree that left seven dead and 48 injured.
The Sun quoted a friend of the supposed ringleader of the attack - who it named only as 'Abz' - as saying he called police about the 27-year-old's extremist views which were said to have been ignited by YouTube videos.
The source, who has not been named, said he contacted police in Barking, east London, after the Watford-born married father-of-two discussed Islamic State-inspired terror attacks.
He told BBC's Asian Network that the jihadi had become radicalised after watching clips of US hate preacher Ahmad Musa Jibril.
