Asked if anyone convicted of terror offences should service their full sentence – as Boris Johnson has now pledged – the Labour leader said: “Not necessarily, no.”
Mr Corbyn said the decision “depends on the circumstances, it depends on the sentence but crucially depends on what they’ve done in prison”.
The prime minister has vowed an end to early prison release for terrorists – and minimum sentences of 14 years – in response to fierce criticism of the freeing of Usman Khan.
But Mr Corbyn said what was crucial was “how our prison services work and what happens to them on release from prison”
He pointed out that the Parole Board had no involvement in Khan’s release, adding: “There were apparently no probation service involvement in monitoring this former prisoner.
Mr Corbyn said: “There has to be an examination of what goes on in the prison because prisons ought to be a place where people are put away because of major serious offences, but also a place where rehabilitation takes place.”