ISIS Purportedly Beheads U.S. Journalist James Foley [VIDEO]

Calling it retaliation for U.S. airstrikes in Iraq, Sunni militants have apparently beheaded an American journalist.

FOX News Radio’s Rachel Sutherland reports from Washington.

In a disturbing video, a dark figure speaks in a British accent and says they’re going to kill James Foley, who’s kneeling beside him, because of U.S. airstrikes.

He then beheads Foley, who is dressed in an orange jumpsuit. The ISIS militant then threatens to kill another American journalist, Steven Sotloff, who also appears in the video, also dressed in an orange jumpsuit.  

U.S. officials tell the AP the video is authentic.  

In Washington, Rachel Sutherland, FOX News Radio.

James Foley’s apparent killer appears to speak with a British accent.

FOX News Radio’s Simon Owen reports from London.

Britain’s Prime Minister David Cameron cutting short his summer vacation to lead the U.K.’s response to the apparent murder of James Foley.

In the video claiming to show his execution by militants with the group called Islamic State, his killer speaks with an English accent.

(Hammond) “This is an international problem.”

Britain’s Foreign Secretary Phillip Hammond, saying it’s no secret that Islamic State has fighters from the U.K., the U.S., France and others.

(Hammond) “We have been saying for months now that this is not just a problem for Iraq or Syria. It is a problem for us here in the U.K., in Europe, in North America.”

Hammond calling the execution appalling and brutal.

In London, Simon Owen, FOX News Radio.