Investigative current affairs. With their stronghold of Mosul under fierce attack and Raqqa next in the frame, IS has intensified its global propaganda offensive, calling for more lone jihadis to slaughter civilians using knives and trucks. IS in Syria now direct attacks, giving lone jihadis targets and instructions via encrypted apps that leave intelligence agencies in the dark. Reporter Peter Taylor investigates the escalation of this global phenomenon, travelling to the US to talk to the deputy director of the FBI and to go on patrol with the NYPD. He asks what the UK government can do to prevent radicalisation of young people and talks to Britain's most senior anti-terror police officer about what authorities here are doing to protect us in the face of this growing threat
