Elite British and US special forces troops are forming a hunter killer unit called Task Force Black – its orders: “Smash the Islamic State.”

The undercover warriors will aim to “cut the head off the snake” by hitting the command structure of the Islamist terror group responsible for a trail of atrocities across Iraq and Syria, reports the Sunday People.

PM David Cameron has told the SAS and UK spy agencies to direct all their ­resources at defeating IS after a video of US journalist James Foley being beheaded shocked the world.

British special forces will work with America’s Delta Force and Seal Team 6. The move sees a rebirth of top secret Task Force Black, which helped defeat al-Qaeda terrorists in Iraq .