MI5 must to improve its systems for ongoing investigations into terrorist suspects, the chief coroner said today in a report over the London Bridge terror attack.
Mark Lucraft QC also said new laws are needed to ban possessing extremist propaganda in his report into the deaths of eight people and their attackers.
He told how a gap in legislation means it may be impossible for police or MI5 to act even when 'the material is of the most offensive and shocking character'.
He highlighted 18 'matters of concern' in a report on preventing future deaths, which was published today after inquests into the deaths on the evening of June 3 2017.
Police officers walk down Borough High Street following the terror attack on June 3, 2017
Emergency services at the scene of the London Bridge and Borough Market attack in 2017
Khuram Butt, 27, Rachid Redouane, 30, and Youssef Zaghba, 22, were ruled to have been lawfully killed after they were shot dead by armed police
They ploughed a rented van into pedestrians on the bridge before stabbing people at random around Borough Market.
A separate inquest concluded that Xavier Thomas, 45, Chrissy Archibald, 30, Sara Zelenak, 21, James McMullan, 32, Kirsty Boden, 28, Alexandre Pigeard, 26, Sebastien Belanger, 36, and Ignacio Echeverria, 39, were unlawfully killed.
The Old Bailey inquest heard that Butt, who was an MI5 subject of interest (SIO), had looked at extremist material online in the months and years before the attack, including propaganda for so-called Islamic State, violent images and sermons from extremist preachers.
An armed police officer on London Bridge as officers deal with the terror attack in June 2017
Bereaved families said MI5 and counter-terror police should review their assumptions about the weight placed on an SIO's so-called mindset material.
Mr Lucraft said there is no evidence investigators are not capable of making those judgments properly after police and security services pointed out that many SIOs possess