Raffaello Pantucci

The UK is home to up to 25,000 Islamist extremists who could pose a threat, the EU’s top terror official has warned.

Officials have warned that the threat from home-grown jihadis who are prevented from joining Isis in Syria and Iraq is increasing, with the group inciting global terror attacks to maintain momentum.

British security agents try to identify the masked militant who spoke in clear English accent in a new ISIS execution video released recently in which he is seen shooting an alleged British spy.