James Foley beheading: 'Isis is a bigger threat to the US than al-Qa’ida', Pentagon warns

Chuck Hagel said the group's funding, sophistication and military prowess was 'beyond anything seen'

The Islamic State (Isis) presents a greater threat to the US than al-Qa’ida and must be defeated, the Pentagon has said.

The American Defence Secretary, Chuck Hagel, sounded a warning on Thursday in the wake of the brutal beheading of journalist James Foley.

“They are an imminent threat to every interest we have, whether it's in Iraq or anywhere else,” he said.

“They are beyond just a terrorist group. They marry ideology, a sophistication of […] military prowess.

“They are tremendously well-funded. This is beyond anything we've seen.”

Isis militants have killed countless civilians and terrorised the population of Iraq in a bloody sweep through the north of the country this summer, after gaining strength in Syria’s civil war.

The murder of Mr Foley, who was captured by militants in 2012 while covering the struggle against the Assad regime, has shocked the world.

Video: Isis warning to the West

Footage released by Isis showed his killer, apparently a British citizen known as “John” threatening the US with retaliation for air strikes in Iraq in a video entitled “A Message to America”.

Read more: President Obama calls the jihadists’ bluff and launches fresh air strikes against Isis targets
David Cameron returns to lead condemnation of ‘brutal, barbaric’ murder of journalist
Isis could launch international terrorist attacks, Foreign Secretary warns

Philip Hammond, the Foreign Secretary, called the murder “one more example in a catalogue of brutality” by the Sunni militant group.

The video shows a man, thought to be James Foley, kneeling in front of a black-clad militant The video shows James Foley kneeling in front of a black-clad militant before being decapitated Warning of possible international terrorist attacks if they gain a foothold, he added: “Isis are waging war on moderate Islamic opinion and they are waging war on the West and we have to deal with them on that basis.”

Asked if Isis posed a threat comparable to that of the New York 9/11 terror attack, Mr Hagel said it was “as sophisticated and well-funded as any group we have seen”.

He spoke as US forces continued attacking Isis targets in Iraq after 89 strikes in two weeks by drones and fighter jets.

Barack Obama has so far attempted to limit the renewed military campaign to protecting American diplomats and civilians under direct threat after being elected on his promise to end his country’s involvement in the Iraq war.

US officials say they have not ruled out escalating military action against Isis, which has increased vocal threats since the air campaign in Iraq began.

“We haven't made a decision to take additional actions at this time, but we truly don't rule out additional action against ISIL [Isis] if it becomes warranted,” Ben Rhodes, a senior Obama aide, told National Public Radio.

David Cameron cut his family holiday in Cornwall short on Wednesday to return to Downing Street for emergency meetings on the crisis.

The Prime Minister has repeatedly said ground troops will not be sent to Iraq, despite rumours that special forces are already there.

Humanitarian aid, technical support and surveillance has so far been provided in support for Iraqi and Kurdish forces battling the jihadists.

Additional reporting by Reuters

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