In the UK, a political row has erupted following a lethal terror attack, which killed two people. Usman Khan fatally stabbed two members of the public with a knife and injured three others before being shot dead by police.

On the BBC's Andrew Marr show, UK Prime Minister Boris Johnson blamed laws passed by a Labour government more than a decade ago.

"I think this whole system of automatic early release which was brought in by Labour, said Mr Johnson. 

"I think it's ridiculous, I think it's repulsive that individuals as dangerous as this man should be allowed out after serving only eight years and that's why we are going to change the law."

In 2012 Khan was convicted of terrorist offences and jailed for 16 years. Launching his murderous attacks shortly after being released in half that time. 

Khan was Britain's first convicted terrorist to have launched such a lethal attack after being released from prison and the question is how it could have happened? Amid heated general election campaigning, the main political parties are pointing the finger of blame at each other.

Among the conditions of his release was the wearing of an electronic tag. However, neither the prison service parole board nor Britain's probation service were involved in the decision to allow him out.

The law has since changed on automatic release. But, perhaps inevitably amid the bitter arguments of a general election, the outrage has turned political.

Opposition Jeremy Corbyn is calling for a re-examination of the UK's judicial system, but he does not say terrorists should be forced to serve their full term.

Corbyn spoke about the most recent terror attack at his campaign launch event and said "I do think there are lessons that we have to learn from this and there has to be a very full investigation into the circumstances of the prison sentence that was served and the release from it.

"The war on terror has manifestly failed, Britain's repeated military interventions in North Africa and the wider Middle East, including Afghanistan have exacerbated rather than resolved the problems. 

"Real security requires calmly making the right calls at moments of high pressure, often against the grain of conventional wisdom. That requires the courage and strength to chart an independent course when we think our friends and allies are doing the wrong thing. 

Jo Swinson, Leader of the Liberal Democrat party spoke to BBC Radio 5 Live saying "This was an opportunity for Boris Johnson to be a statesman and yet again he has failed in that and just shown why he is not fit for the job of Prime Minister. 

"You've got a city in shock at this and you've got a community which is coming together in a brilliant way and straight out the doors the Prime Minister is making it an election issue, I just think it's pretty distasteful."

The UK general election is scheduled to take place on 12th December, you can keep up to date with it by reading our daily At-A-Glance updates.