BREAKING NEWS

UK Prime Minister: ISIS militants are plotting 'terrible' attacks in Britain

Prime Minister David Cameron warned on Monday that Islamic State militants based in Syria and Iraq were planning specific attacks against Britain, saying they posed an existential threat to the West.

"There are people in Iraq and Syria who are plotting to carry out terrible acts in Britain and elsewhere and as long as [Islamic State] exists in those two countries we are at threat," Cameron told BBC radio.

Cameron was speaking after an Islamist gunman killed up to 30 British tourists in an attack on Friday that British politicians have described as the single worst assault on their nationals since the bombing of the London underground in 2005.