Suspicious drone activity over the British base RAF Lakenheath

The incident occurred on Friday evening. A US Air Force spokesman said in an emailed statement to Reuters that cooperation with British partners was ongoing.

We continue to work closely with host nation officials to ensure the safety of American soldiers, U.S. and British civilians, the spokesman noted.

The report of the drones comes after other security incidents around military installations in the UK.

In recent weeks, the US withdrew bombers from the UK that were previously used in attacks on Iran. In turn, large air refueling aircraft were moved from British bases to Germany.

Incident investigation at RAF Fairford

The bombers left RAF Fairford following the incident on September 27, when a group of men in white vans allegedly approached the site at night.

Two men were charged last month in connection with the case. The prosecutor's office claims that one of them tried to assist Iranian intelligence on British territory.

The U.S. Department of Justice said this week that a member of an Iran-backed group allegedly planned an attack on RAF Fairford while he was in U.S. custody on criminal charges.

In October, the head of Britain's MI5 counterintelligence service warned that Iran had stepped up its attempts to attack more difficult, better-protected targets, including military facilities in Britain.

The Iranian authorities have rejected accusations of involvement in the Fairford incident and other hostile activities on British territory.