G8 leaders are gathering in Northern Ireland - but differences between Russia and the US over what to do on Syria are already looming large.
UK Prime Minister David Cameron is set to meet with security advisors to discuss how to respond to the beheading of a British aid worker. David Haines had been seized by Islamist militants in Syria last year.
British Prime Minister David Cameron has pledged to do anything necessary to help defeat "Islamic State" militants. Cameron spoke after an emergency meeting, which came in response to the beheading of a UK national.
Britain's prime minister is set to chair an emergency meeting to discuss how to respond to a video showing the beheading of a British aid worker. David Haines had been seized by Islamist militants in Syria last year.
President Barack Obama vowed that the US would stand "shoulder to shoulder" with the UK after the apparent murder of Briton David Haines. Islamic State militants released a video claiming to show his murder.
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