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(CNN) - British officials "are close" to identifying the ISIS militant who beheaded American journalist James Foley, according to Britain's ambassador to the United States, Peter Westmacott.
Westmacott told CNN's Candy Crowley on Sunday he couldn't elaborate on the identity of the killer, who is seen decapitating Foley in a video posted last week on YouTube.
"We're putting a great deal into the search," he said, referring to the use of sophisticated technology to analyze the man's voice.