Live Updates: Police to Release 5 Men on Bail After Possible Terror Plot at U.K. Air Base The suspects remain under investigation with “stringent conditions,” a British official said. The base, R.A.F. Fairford, is used by the United States in its war against Iran.

Latest Counterterrorism police in Britain on Monday said that five men arrested in connection with a possible terror plot at a British military base are being released on bail but remain suspects in the ongoing investigation.

Laurence Taylor, the head of Britain’s counterterrorism police, said in a brief statement to reporters that the men would be “subject to stringent conditions on their movement and contact with others. They absolutely remain under investigation as we explore multiple lines of inquiry.” Mr. Taylor acknowledged widespread speculation about whether the men, who were arrested in the early hours of Sunday morning near the base, R.A.F. Fairford, in southern England, were connected to Iran. The base has been used extensively by the United States in its bombing campaign against that country.

Iran’s embassy in London denied any connection to the suspected plot, saying in a statement on Monday that it “categorically rejects and strongly condemns” what it called “unfounded and malicious speculations” about the incident.

Mr. Taylor declined to confirm that speculation but said that police are “considering this from every possible angle, including that this may be actively committed by proxies or individuals, either knowingly or unknowingly, working on behalf of a foreign state.” Earlier Monday, the counterterrorism police said in a statement that the five men were in their early 20s and were British nationals from London. The police have not named the men, in line with British policing rules that grant anonymity to suspects until they are charged.

It is still unclear what happened near the perimeter of the base, but conflicting accounts about the incident have already raised questions about the security of the site. A bomb disposal robot spent most of the day examining three white vans that police said were driven by the suspects. Dozens of families living nearby were evacuated from their homes. Mr. Taylor said efforts were underway to let the families return as soon as possible.

The United States Air Force primarily uses R.A.F. Fairford to deploy some of its largest bombers and has been at the center of controversy this year over its role in the American-Israeli war against Iran.

In July, Iran’s Islamic Revolutionary Guards Corps warned the British government that allowing American bombers to conduct strikes against Iran would make “London responsible for” any consequences.

Here’s what else to know: Emergency meeting: Prime Minister Andy Burnham of Britain, who is expected to give a major policy speech at his Labour Party’s conference in Liverpool on Tuesday, said that he would chair a meeting of the government’s emergencies committee, known as Cobra, to discuss the Fairford incident with top government advisers on Monday afternoon.

Taylor’s annoucement that the suspects would be released on bail with no further explanation was somewhat jarring in light of President Trump’s comments to reporters on Sunday. An exuberant Trump said the suspects had intended to do “big damage” to the air base and praised the British police, describing their efforts as “fantastic” and “amazing.” He added: “We had them under view for a long time and we got them.” Now the five men are going to be freed on bail, but with stringent conditions on their movement and contact with others.

The release of the five men on bail is sure to raise new questions about what investigators have — or have not yet — found at the scene and whether they believe the men were close to carrying out some kind of terrorist attack, particularly as the prime minister is set to chair an important national meeting on what happened.

Many questions about the episode remain unanswered. Taylor, the counter terrorism chief, did not say whether investigators had found explosives in the three vans that the suspects were driving. He did not discuss the potential target nor a motive. Nor did he take any questions from reporters.

There was considerable confusion about whether the British police had been watching the suspects before the arrests after President Trump said on Sunday: “We had them under investigation.” Counterterrorism experts said that typically investigators would arrest any suspects before they attempted to carry out an attack, suggesting that British authorities might have been aware of a general threat but not the specifics. Taylor did not address that confusion in his statement. Taylor said that he hopes that residents who were evacuated from their homes near R.A.F. Fairford on Sunday will be able to return later today.

The plot has raised questions about whether Iran or Russia was involved. The attempted attack bore some similiarities to previous attacks coordinated by those countries. On Monday, Iran’s embassy in London said it “categorically rejects and strongly condemns” speculation that Iran was connected to what had happened.

The plot has raised questions about whether Iran or Russia was involved. The attempted attack bore some similiarities to previous attacks coordinated by those countries. On Monday, Iran’s embassy in London said it “categorically rejects and strongly condemns” speculation that Iran was connected to what had happened.

Taylor provided little further information about the suspected terror attack, but said the police were investigating whether this plot was “actively committed by proxies or individuals.” A top British counterterrorism official, Laurence Taylor, said the five men arrested are being released on bail but remain under investigation.

Prime Minister Andy Burnham said Monday that he will chair a meeting of the government’s emergencies committee, known as Cobra, to discuss the Fairford incident with top advisers on Monday afternoon. Mr. Burnham is attending the Labour Party’s annual political conference in Liverpool, but told LBC Radio that he would convene the national security meeting before giving his keynote speech on Tuesday. The British police arrested five men on Sunday on suspicion of preparing acts of terrorism after receiving a call around 1 a.m. about three suspicious vehicles headed toward an air force base used by the American military.

The base, R.A.F. Fairford, is primarily used by the United States Air Force to deploy some of its largest bombers and has been at the center of controversy this year over its role in the American-Israeli war against Iran.

It is not yet clear whether Sunday’s incident is connected to the conflict in the Middle East, but investigators are looking into whether there is any link to Iran or Russia. Both have been accused of orchestrating attacks on British soil.

“Any base used to launch attacks on Iranian territory is a legitimate target for our forces,” it said.

When asked by reporters on Sunday about the arrests, President Trump said, “Working with Britain — it was an amazing job.” Appearing to refer to the suspects, he said: “We had them under investigation. They were looking to do big damage.” Mr. Trump’s statement raised questions about whether the suspects had been under surveillance and, if so, how they were able to get so close to the base, possibly with explosives.

When asked by reporters on Sunday about the arrests, President Trump said, “Working with Britain — it was an amazing job.” Appearing to refer to the suspects, he said: “We had them under investigation. They were looking to do big damage.” Mr. Trump’s statement raised questions about whether the suspects had been under surveillance and, if so, how they were able to get so close to the base, possibly with explosives. British officials said they had evacuated more than 85 homes in the rural village outside the air base in southern England early Sunday morning. On Sunday afternoon, hours after the arrests, aerial footage showed what appeared to be a bomb disposal robot continuing to operate near three white vans.

“A 400-meter cordon has been put in place around the vehicles while the army’s explosive ordnance disposal unit conduct examinations,” Vicki Evans, the deputy assistant commissioner of the British counterterrorism police, said in a statement.

Ms. Evans said that the counterterrorism police were leading the investigation. She said that the five men remained in custody under suspicion of “preparation of a terrorist act” and “suspicion of committing offenses under the Explosives Act.” The men were not named, in line with British policing rules that grant public anonymity to suspects until they are charged.

Officials did not provide any further information about what the five men were suspected of doing, and the local police took no questions during a brief appearance in front of reporters.

After the arrests, the American Embassy in Britain issued a warning.

“U.S. citizens are encouraged to exercise caution and be mindful of personal security,” it said. “U.S. citizens are advised to follow instructions of local authorities for their personal safety and security.” American B52 and B-1 bombers loaded with munitions have repeatedly taken off from Fairford on missions to Iran since the war there began in February. The previous British prime minister, Keir Starmer, initially refused to allow the Trump administration to use the base for strikes at the start of the conflict, but later gave permission for what he called “defensive” operations. His successor, Prime Minister Andy Burnham, has continued that policy, officials said.

Richard Ocone, the assistant chief constable for the Gloucestershire Police, the local force in the area containing the air base, said the incident had begun around 12:45 a.m., when his department received a call about three suspicious vehicles traveling toward the base.

“The emergency services have well-rehearsed plans for dealing with major incidents such as this,” he said, adding that “we are working closely with our partners in counterterrorism policing.”

Earlier, a police statement said that the authorities believed the incident was “contained.” Prime Minister Burnham said in a statement Sunday afternoon that he understood the incident would be “deeply concerning for local residents and for many people following developments across the country.” He thanked the police and the armed forces, and said, “The investigation remains ongoing, and I would urge people not to speculate while the authorities establish the full facts.” The United States Air Force referred questions about the incident at the base, which is home to both the 501st Combat Support Wing Headquarters and the 420th Air Base Squadron, to the British authorities.

In a statement, it said: “U.S. European Command remains vigilant and will take appropriate actions to ensure the safety and security of our U.S. service members, civilians, contractors, and their families across the European theater. We constantly assess a variety of factors that determine what measures we institute or modify to protect our installations, our people and their families.” Fairford has been an American base of operations for decades. The station opened in preparation for D-Day in 1944. With a runway more than 9,990 feet long, it is one of only a few European airfields that can be used by heavy U.S. bombers.

In the past two years, there have been several so-called hybrid attacks — hostile actions devised to evade culpability — in Britain and Europe that intelligence officials say were probably carried out by Russia or people connected to it, or by proxies operating on behalf of Iran.

In Britain, two men were convicted in June of conspiring to carry out arson attacks targeting properties and a car linked to Mr. Starmer after one of them was recruited by a Russian-language Telegram account. The fires at two houses and a vehicle, all of which Mr. Starmer had owned or used, happened over five days in May 2025.

And in July, the British government accused a proxy of Iran’s Revolutionary Guards of directing a wave of actions against Jews in Britain and Europe, including a series of arson attacks on synagogues. Adam Goldman contributed reporting from London