Undercover armed soldiers will mingle in crowds at some of August bank holiday's biggest events amid fears of another terror attack.
Plain-clothed troops carrying hidden guns will pose as ordinary members of the public at Notting Hill Carnival as well as the Leeds and Reading music festivals as the UK threat level remains at “severe”.
It comes after ISIS claimed responsibility for two more terror attacks which happened in Spain's Barcelona and Cambrils last Thursday evening.
So far this year Britain has been hit with brutal attacks in Westminster, Manchester, London Bridge and Finsbury Park.
According to the Times, a security source said armed soldiers will mix with festival-goers. The guns will be beneath their clothes and they will not be in typical military vehicles.
It is thought the troops will use civilian armoured vehicles, meaning standard cars which have been replaced with bulletproof glass or extra defences.
The Met Police did not comment on reports the Notting Hill Carnival, which usually welcomes around two million revellers, will see anti-vehicle ramming barriers.
It comes after the government ordered drivers to face extra checks when renting cars of vans in the wake of Spain’s deadly attacks.
Ministers expressed concern at the ease extremists can rent vehicles and using them to mow down pedestrians.
Anti-terror barriers and concrete blocks on London’s bridges were erected earlier this year following the first terror attack in March.
David Videcette, who was in the Met’s counter-terror unit for six years until 2010, previously told the Standard terrorists are “flexible” and will find ways around measures already in place.