British PM threatens IS, makes no commitment on strikes

Prime Minister David Cameron said Britain was ready to "take whatever steps are necessary" to destroy Islamic State militants after they murdered a British aid worker, but made no commitment to joining the United States in air strikes.<br /><br />After chairing a meeting of the government's emergency Cobra committee, Cameron said the extremists behind the beheading of David Haines were the "embodiment of evil" and said they would bring them to justice, no matter how long it takes,"