Politicians behind the 'War on Terror' are guilty of "the greatest crime of this century to date", an adviser to Jeremy Corbyn said tonight.

Andrew Murray made the comments at a Labour conference rally as he declared Jeremy Corbyn is "on the threshold" of installing an anti-war government in Downing Street.

Speaking at a fringe event organised the by Stop The War coalition, he said: "We're still mired in the 17 year old war on terror that has rolled from one country to another, destroying millions of lives, wrecking societies, causing economic and migrant crises across the world, that has not succeeded in solving a single problem, that has seen its authors defeated in one country after another.

"It's time that any government in Britain had the courage to stand up and say enough is enough, we are not fighting this any more."

Mr Murray spelt the damage wreaked by Western intervention in Aghanistan, Libya, where the Mediterranean migrant crisis was "largely as a consequence of that war", and finally Iraq.

He added: "This war has been a calamity, calamity for humanity.

"The people that authored it are guilty in my view of the greatest crime of this century to date.

"And those of us who opposed it have been unfortunately, tragically proved right in every single warning we issued."

The deeply divisive wars in Afghanistan and Iraq were launched in the wake of the 2001 terror attacks on the World Trade Centre.

(Image: PA)

Mr Murray also told the packed meeting past policy could be linked to the Manchester Arena attack.

"In the general election last year, after the terrible terrorist atrocity in Manchester, Jeremy Corbyn said we condemn this without reservation, we condemn its perpetrator without reservation, but we also say the foreign policy we have followed has failed," he said.

"It has contributed to the environment in which these sort of atrocities continue to take place."

Mr Murray works for Unite general secretary Len McCluskey and is also a part-time adviser to Mr Corbyn.

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He wrote in the New Statesman recently that there was “possibly someone being paid by the taxpayer” to prevent Labour coming to power.

When asked what he would do if the "deep state" tried to block Mr Corbyn's foreign policy aims, Mr Murray said: "We would rely on the mobilisation of the mass of people as we did in 2003."