A WORCESTERSHIRE MP has revealed his anguish over the Islamic State crisis - saying it is the "biggest threat the world faces".

Sir Peter Luff, a former junior defence minister for David Cameron, said he has grave concerns about the rise of the brutal IS militants.

"The whole situation is desperate, and the underlying problems are also very serious," he said.

"I believe this is the biggest threat the world faces and it is vital we are committed to a unified approach across a 'world Coalition' that is willing to tackle it.

"The US has been a bit slow with its strategy but there's still been 160 bombing missions.

"But we must be clear that this will take many months, if not years to deal with."

Following a summit of foreign ministers from over 30 countries the Prime Minister believes the United Nations will back an international coalition strategy for tackling IS.

The extremists have seized swathes of territory in Iraq and Syria.

Calls for Parliament to be recalled so MPs can consider and potentially vote on military action are growing, with deputy Labour leader Harriet Harman saying Mr Cameron should re-convene the Commons if force is to be used.

Foreign Secretary Philip Hammond has revealed the Government does not know the whereabouts of hostages held by IS, including a British captive who the militants are threatening to kill.

The extremists are now threatening to murder former cab driver Alan Henning, who was snatched while travelling with an aid convoy in Syria.

The threat follows the killing of British aid worker David Haines and two American journalists.