US Air Force responds to 'unauthorized drone activity' at RAF Lakenheath, the third threat to a US base in Britain in weeks

Security forces at RAF Lakenheath in eastern England responded Friday to suspected unauthorized drone activity over the base, which hosts U.S. Air Force F-35 fighter jets, U.S. and British defense officials said, The Times of Israel reports.

U.S. Air Forces in Europe said no personnel, aircraft or infrastructure were affected. "We continue to work closely with our host nation counterparts to ensure the safety and security of our US service members," its statement said. A British Ministry of Defense spokesperson said the incident had been "resolved" and that the ministry was working with the Americans to determine what happened.

It is the third threat to a U.S. base in Britain in recent weeks. Days ago the U.S. moved more than a dozen aircraft out of nearby RAF Mildenhall because of a threat, and the base raised its alert level to FPCON Charlie, the second-highest level, used when a terrorist action is judged likely.

Earlier, British authorities linked a plot against RAF Fairford, the base used by American bombers in the Iran war, to Iran. At least three men alleged to be Iranian operatives have been charged in the U.S. with plotting to attack Fairford, and the U.S. pulled its bombers from that base.

Officials have not said who was behind Friday's drone activity.