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More than 6,000 bloodthirsty Islamic State fighters have been killed by British and US coalition forces along with half the terror group’s top command, it was revealed.

But speaking after a major summit in London, US Secretary of State John Kerry warned that defeating ISIS remained a “huge task”.

He was one of 21 foreign ministers who met in Westminster to agree to step up the fight against ISIS.

Air strikes by the US-led coalition began last year.

Mr Kerry said: “We are taking out fighters, in the thousands thus far. Fifty per cent of the top command has been eliminated.”

He said the coalition had made almost 2,000 air strikes and helped reclaim 700 square kilometres of Iraq.

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But earlier British Foreign Secretary Philip Hammond warned defeating ISIS could take another two years as the Iraqi army was still in a “state of disarray”.

A pledge to stop the flow of foreign fighters into Syria was overshadowed by a warning from Turkish PM Ahmet Davutoglu that he cannot stop people crossing the border.

He said: “It’s a 937km border, it’s impossible to do.”