Key findings of watchdog report into Rigby's killers

Here are the key findings of a report by the Intelligence and Security Committee into what prior knowledge intelligence and security services had of Lee Rigby's killers ahead of his murder.

• Lee Rigby's killers Michael Adebowale and Michael Adebolajo appeared in seven different agency investigations as low-level subjects of interest before they murdered the soldier.
• There were errors in agency operations, where processes were not followed, decisions not recorded or delays encountered
• The report concluded that despite the errors MI5, MI6 and GCHQ could not have prevented the murder of Fusilier Rigby
• Agencies had no knowledge of an online exchange between Adebowale and an overseas extremist in 2012 in which he reveals he intended to murder a soldier as it was not reported by a US web firm
• Report says the unnamed web firm 'however unintentionally' provided a 'safe haven' for terrorists
• 'Highly unlikely' agencies could have discovered the exchange before the attack
• 'Significant possibility' MI5 could have prevented the murder of Lee Rigby if the exchange had been reported