ISIS executes British aid worker David Haines; Cameron vows justice

A video released Saturday by the extremist group known as the Islamic State of Iraq and Syria, or ISIS, purports to show the killing of British aid worker David Haines. Britain's Foreign Office said that it was aware of the video and was working to

(CNN) — British aid worker David Haines has been executed by ISIS militants, according to a video posted Saturday to a website associated with the group, making him the third Western captive to be killed by the Islamist extremist group in recent weeks.

British aid worker David Haines has been executed by ISIS militants, according to a video posted Saturday to a website associated with the group, making him the third Western captive to be killed by the Islamist extremist 

The beheading of Briton David Haines, held hostage in Syria, has purportedly been shown in a newly released video. Although the Foreign Office is still working to verify the video, PM David Cameron described the murder as an "act of pure evil". Mr

The beheading of Briton David Haines, held hostage in Syria, has purportedly been shown in a newly released video. Although the Foreign Office is still working to verify the video, PM David Cameron described the murder as an "act of pure evil". Mr