Scotland Yard named two of the London Bridge attackers as Khuram Shazad Butt and Rachid Redouane, both from Barking in east London. Officers are now working to find out more about them and whether they were assisted by anyone else. Last year, Butt was featured in a Channel 4 documentary about British jihadis. Anti-terrorism chief Mark Rowley said that Butt, who was a British citizen born in Pakistan, had been known to the police and MI5, but there had not been evidence that he had been planning an attack. So how did he slip through the net? Subscribe for more: bit.ly/LtASif.