Terrorists using new bomb-making methods could use drones to blast crowded high streets or football grounds, it is feared.
British military intelligence has been secretly warned that the chilling technology could make it far easier to launch drone attacks.
There are fears that when lockdown is over terrorists could launch a commercial drone, carrying an improvised explosive device, from a hotel room and fly it into a crowded place like London’s Oxford Street.
The chilling new technology, which could also carry chemical weapons, has emerged in recent months and has been tested by Iranian-backed rebels on the killing fields of Yemen.
It is feared Iranian terror groups may have passed this method of bomb-making on to jihadist groups linked to al-Qaeda and ISIS.
Iranian intelligence agents regularly use proxy groups to launch attacks against Tehran’s perceived enemies – and the UK is seen as a close ally of America.
has learned that the Defence Intelligence, a unit within the Ministry of Defence, has been warned of the new Iran-sourced threat.
One fear is that terrorists will have the ability to fly a drone equipped with 5kg of explosives.
A source said: “It is only a matter of time before this new methodology is passed on to groups who have an interest in attacking Britain.
“The bombs can be detonated by infra-red triggers, primed so they attack a specific vehicle in a convoy or loaded on to a drone and flown into a crowd.”
A Ministry of Defence spokesman said: “Defence Intelligence keeps all potential threats under review to help protect the United Kingdom.”