A former head of the Metropolitan Police’s counter-terrorism command has argued attacker Usman Khan should have been barred from entering central London as part of the conditions of his early release from prison.
Richard Walton also suggested longer prison terms and better deradicalisation programmes within jails are needed to help stop offenders committing attacks after they are released.
“His licence conditions should have restricted him from visiting central London,” he said.
“It is unusual for terrorist prisoners who have been released to go on to commit attacks. Every case is unique and risk assessments are complex.
“The only way to be 100 per cent certain of zero risk is to keep a prisoner in prison. All forms of surveillance have limitations.”
Usman Khan was freed on licence in December 2018 and was wearing an electronic monitoring tag when he launched the attack.
UK head of counter-terrorism policing Neil Basu said Khan had been subject to multi-agency public protection arrangements (MAPPA) and had complied with an “extensive list of licence conditions” following his early release.
The precise terms of Khan’s release are not yet known.