British Prime Minister David Cameron condemns the beheading of British aid worker David Haines by Islamic State, saying ''they are not Muslim, they are monsters''. Vanessa Johnston reports.
Top military and political officials arrive at Ten Downing Street for an emergency meeting Sunday... ...after a video released by Islamic State appeared to show the beheading of British hostage David Haines. British Prime Minister David Cameron calls the aid worker "a British hero", and says the UK and its allies must "destroy" IS. (SOUNDBITE) (English) BRITISH PRIME MINISTER, DAVID CAMERON, SAYING: "They are killing and slaughtering thousands of people, Muslims, Christians, minorities across Iraq and Syria. They boast of their brutality, they claim to do this in the name of Islam. That is nonsense, Islam is a religion of peace, they are not Muslims they are monsters." This is the Croatian village where Haines lived. The 44-year-old father of two from Scotland was kidnapped in Syria last year. His executioner had a British accent and appears to be the same man featured in videos of the murder of two American journalists. Cameron, who is under growing pressure to sanction air strikes, says he isn't ruling out any options to degrade IS -- with the exception of boots on the ground.