(AGI) London, Sept 14 - British Prime Minister David Cameronhas condemned the murder of aid worker David Haines by IslamicState militants. "It was an act of pure evil," David Cameronsaid after the release of a video appearing to show the Britishhostage's beheading. "My heart goes out to his family who haveshown extraordinary courage and fortitude throughout thisordeal." The Prime Minister is expected to chair a meeting ofthe government's COBRA emergency committee on Sunday morning. . .