Mourners planning to attend the Queen's funeral have been told to be constantly on their guard for potential terrorists who would seem "blatantly out of place" and uninterested in ceremonial events.
Former counter-terrorism police chief Nick Aldworth, who was the national co-ordinator until 2019, said it is vital well-wishers be extra vigilant on Monday.
He advised members of the public to instantly report anyone who appears more interested in what the police are doing and are acting secretively.
