U.S. Air Force security personnel responded to suspected unauthorized drone activity at RAF Lakenheath in eastern England on Friday, prompting shelter-in-place instructions, air raid sirens, and heightened security measures at the installation. The military confirmed that personnel investigated the reported activity but said no service members, aircraft or infrastructure were affected. The incident followed reports of alarms sounding at Lakenheath and neighboring American military installations in Suffolk. British officials subsequently said the situation had been resolved.

Video obtained by the newsroom captures the sirens sounding near Lakenheath. Sirens were also reported at nearby RAF Mildenhall and RAF Feltwell, although those reports have not been independently verified.

A U.S. Air Force spokesperson confirmed that security forces had responded to reports of an unauthorized drone near the installation. The military said it was coordinating with British authorities to protect American personnel, civilian employees, contractors and their families. Sky News obtained an emergency alert instructing personnel at Lakenheath to seek shelter during the incident. Authorities have not disclosed how many drones may have been involved or identified their operators.

The incident occurred amid increased security measures at American air bases in the United Kingdom following reports of a possible threat to military installations. RAF Lakenheath, which houses the U.S. Air Force's 48th Fighter Wing, operates F-15E Strike Eagle and F-35A Lightning II aircraft. Nearby RAF Mildenhall supports American aerial refueling and special operations missions. Both installations had previously been reported to be operating under heightened force protection conditions.

Reports circulated Friday that multiple installations had been placed at Force Protection Condition Delta, the highest level in the U.S. military's force protection system. Keryex received information from sources indicating that security measures had been elevated, but the precise protection status of each installation has not been publicly confirmed by the military. The activation of alarms or shelter procedures does not independently establish that an attack took place. Officials have not publicly linked the suspected drone activity to any foreign government or organization.

Britain's Ministry of Defence said the immediate incident was resolved and that officials were working with their American counterparts to establish the facts. Local lawmaker Nick Timothy also said authorities had indicated there was no threat to the public. The incident highlights the continuing security concerns surrounding unauthorized drone activity near sensitive military installations. Further details about the drone's origin, intended purpose and the military's response have not been released.