US Embassy in London Issues Security Alert Over Suspected Terror Plot Near RAF Base

The U.S. Embassy in London has issued a security alert to American citizens in the United Kingdom following a suspected terror plot that led to five arrests on Sunday near Royal Air Force Fairford, an airbase utilized by the U.S. military.

"U.S. citizens are encouraged to exercise caution and be mindful of personal security," the alert stated. "U.S.-associated facilities, gatherings, and organizations may be at heightened risk. U.S. citizens are advised to follow instructions of local authorities for their personal safety and security."

The warning comes after British police arrested five men on suspicion of explosives and terrorism offenses. Officers detained the men, described as British nationals in their 20s from London, in the early hours of Sunday after responding to a tip-off about three suspicious vehicles heading toward RAF Fairford.

Counter Terrorism Policing (CTP) is leading the investigation. A spokesperson for CTP confirmed that investigators have been examining the scene and developing new lines of inquiry.

British Defense Secretary Wes Streeting told BBC Radio 4 that while it is too early to speculate on motives, authorities are aware of threats from Iran and its proxies. "We know that Iran and their proxies wish to do us harm. We know that they hate our democracy, and we know that we regularly have to thwart Iranian attempts to threaten either our interests or indeed our allies," Streeting said.

CTP's deputy assistant commissioner Vicki Evans acknowledged the speculation surrounding the incident but emphasized the need for time to thoroughly investigate the case.

The alert for Americans also reminded them that the U.K. raised its national terrorism threat level to "severe" in April, following an antisemitic attack in London declared a terrorist incident. A "severe" threat level indicates that an attack is highly likely.

Gloucestershire Police initially responded to the incident after receiving a call at 12:45 a.m. local time on Sunday from a resident who reported finding three white vans blocking a road near the airbase. The resident described encountering a large group of hooded and masked men. Armed officers were dispatched, and the five men were arrested under the Explosives Act and section 5 of the Terrorism Act.

Residents in approximately 85 nearby households were evacuated, and a cordon was established while the British Army's explosive ordnance disposal team examined the vehicles. U.S. President Donald Trump stated on Sunday that the suspects had been under surveillance for an extended period and that joint efforts with British authorities had been successful in apprehending them.

When asked about Trump's remarks, Streeting did not dispute the assertion and commended the work of U.K. police and security services. He also highlighted the strong alliance between the U.K. and the U.S., vowing that both nations would stand together against those who threaten their freedom and safety.