Five men have been arrested near RAF Fairford after suspected explosives were found in three vans, with counter-terrorism police investigating whether the arrests prevented an attack.
British counter-terrorism police are investigating whether the arrest of five men near a U.S.-operated air base in western England prevented an attempted attack linked to Iran.
The men were detained early Sunday near RAF Fairford in Gloucestershire, after police received a report about three suspicious vehicles in the area. Suspected explosive materials were subsequently found in the vehicles, prompting a major security operation and the evacuation of about 85 nearby households.
The investigation is still in its early stages, and British authorities have not established that Iran was behind the incident. The men have also not been charged, and police have not publicly identified their nationalities or stated a confirmed motive.
Iran's embassy in London has rejected suggestions that Tehran was connected to the arrests, describing claims linking Iran to the incident as unfounded.
Five Men Arrested Near RAF Fairford
Police were alerted at about 12:45 a.m. on Sunday after three suspicious vehicles were seen near RAF Fairford.
Armed officers from Gloucestershire Police responded and arrested five men in the Whelford area, approximately one mile from the air base.
The men were initially arrested on suspicion of offences under the UK's Explosives Act. They were subsequently arrested on suspicion of preparing an act of terrorism under Section 5 of the Terrorism Act 2000.
Counter Terrorism Policing is now leading the investigation.
Under terrorism legislation, suspects can be held for significantly longer than under ordinary police arrest powers while investigators examine potential terrorism offences. Police said the five men remained in custody as the investigation continued.
Suspected Explosives Found in Vans
The discovery of the three vans triggered a substantial security response.
Army bomb-disposal specialists were deployed to examine the vehicles and suspected explosive materials. A 400-metre cordon was established around the area while specialists assessed the contents of the vans.
About 85 households were evacuated from nearby properties as a precaution.
Residents were taken to a leisure centre in Cirencester while police and bomb-disposal teams worked at the scene. Authorities warned that an emergency-services presence would remain in the area while the investigation continued.
The Guardian reported that investigators were examining materials that appeared initially to be consistent with improvised explosive devices, although testing was continuing to determine whether the suspected devices were viable.
Did the Arrests Prevent an Attack?
That is one of the central questions investigators are now trying to answer.
British police have not confirmed that the five men were preparing to attack RAF Fairford or that an attack was imminent.
The arrests followed a call from a member of the public who reported suspicious vehicles in the area. According to Reuters, a local farmer said she saw three white vans and people she described as hooded and masked near the base before contacting police.
U.S. President Donald Trump said the suspects had been under investigation and that authorities had been watching them for some time. British officials, however, have not publicly provided details supporting the full extent of Trump's account.
British Defence Secretary Wes Streeting declined to discuss operational details, saying authorities would provide information when they could about the suspects and the nature of the threat.
The distinction is important because investigators have not yet publicly established whether the arrests represented the disruption of an organised terrorist operation or whether the circumstances will ultimately lead to a different explanation.
Why RAF Fairford Is Significant
RAF Fairford is a Royal Air Force base in Gloucestershire that is operated in part by the United States Air Force.
The base has a long history of supporting U.S. military operations and hosts the headquarters of the 501st Combat Support Wing and 420th Air Base Squadron.
Its importance has increased during the current conflict involving the United States and Iran.
U.S. B-1 and B-52 bombers have operated from Fairford during military operations involving Iran. Reuters reported that Britain authorised the United States to use bombers based at Fairford for operations against Iranian missile sites involved in attacks on ships in the Strait of Hormuz.
That has made the facility particularly sensitive at a time of heightened tensions between Washington, Tehran and their respective allies.
Iran Has Previously Threatened Bases Used Against It
The investigation is taking place against the backdrop of previous warnings from Iran concerning RAF Fairford.
Iran's Islamic Revolutionary Guard Corps warned in July that bases used to launch attacks against Iranian territory could be considered legitimate targets, according to Reuters.
The warnings have contributed to heightened security around the facility.
However, previous threats against a military facility do not establish that the five men arrested over the weekend were acting on behalf of Iran.
British investigators are therefore examining the possibility of foreign involvement alongside other potential explanations.
The Guardian reported that investigators were considering an Iranian connection but were also not ruling out other motives, including jihadist or unrelated criminal activity.
Iran Rejects Connection to Arrests
Iran's embassy in London has rejected allegations linking Tehran to the incident.
In a statement reported by Reuters, the embassy said it rejected what it described as speculation connecting Iran to the five British nationals arrested near RAF Fairford.
The embassy's position comes as British counter-terrorism police continue their investigation.
No British authority has publicly confirmed that the suspects were working for the Iranian government, Iran's Islamic Revolutionary Guard Corps or any Iran-linked organisation.
That means any Iranian connection remains an investigative possibility rather than an established fact.
Britain Has Faced Previous Iran-Linked Security Concerns
The investigation also comes amid wider concerns among British security authorities about activities connected to hostile states.
The Washington Post, citing Associated Press reporting, said British intelligence services have previously warned that Russia and Iran have used proxies to carry out criminal activity in Britain. Officials reported a 50% increase in national-security cases involving hostile-state activity, including Iran, in the six months to December 2025.
British authorities have also investigated previous incidents involving suspected Iran-linked activity, including alleged arson and sabotage attempts.
Those cases form part of the security background surrounding the RAF Fairford investigation, but they do not by themselves establish a connection between the current suspects and Iranian authorities.
Investigation Remains Ongoing
The five men remain in custody while investigators examine the suspected explosives, the vehicles and the circumstances surrounding their presence near RAF Fairford.
Police are also expected to investigate communications, movements and possible links between the suspects as they attempt to establish whether there was an organised plot.
For residents near the base, the immediate security operation has involved evacuations, road closures and a continuing police presence.
For Britain, the case carries wider significance because of RAF Fairford's role in U.S. military operations against Iran and the threats previously issued against facilities used for those operations.
But investigators have yet to determine whether the suspects were actually preparing an attack, whether the incident was directed at the air base, or whether Iran played any role.
Until those questions are answered, British authorities are treating the incident as a terrorism investigation rather than announcing a confirmed Iran-linked attack.
