US Secretary of State Marco Rubio says the weekend incident at RAF Fairford "clearly involves the hands of a foreign actor"
Speaking to US media, he doesn't give further details but thanks UK authorities for being "co-operative" and "helpful"
Five men arrested on suspicion of terror offences near the base, which is used by the US military, were released on bail on Monday - here's what else we know
The men - all UK nationals in their 20s who live in London - had been arrested under the Explosives Act and on suspicion of preparing a terrorist act
AC Laurence Taylor, the head of UK counter terrorism policing, has said officers are pursuing multiple lines of inquiry, including if proxies working on behalf of a foreign state could've been involved - the Iranian embassy in the UK denies involvement
Residents from 85 households evacuated on Sunday have started returning home. With a cordon still in place and roads blocked, they want to know how long the disruption will last, writes our reporter
A cordon is still in place around three vans which are being examined by counter-terrorism police.
While residents are being allowed back to their homes, there are still armed police stationed around RAF Fairford.
Image source, Reuters
Image source, Reuters
Image source, Reuters
Marie Lennon
Reporting from the scene
There is still a heavily guarded police cordon around the RAF base at Fairford.
The residents who live in the nearby village of Whelford have been told they can move home, but there is still hesitancy among them.
One local tells the BBC most have returned home, but police are telling them to stay inside and not take any photos.
"I haven’t gone home as I want to wait until I know more about what the hell happened, as it feels super dodge to me," she says.
Nick Johnson
Reporting from RAF Fairford
Aerial footage shows a remote-controlled bomb disposal robot examining the white vans
A cordon remains around the three vans which counter-terrorism police have been examining for possible explosive devices.
I am assuming that no viable explosives have yet been found.
The five men who were arrested on Sunday on suspicion of explosive and terrorism offences near the RAF Fairford military base have been released under investigation, subject to "stringent" bail conditions.
When people are detained under the terrorist act, they can be held for 14 days without charge.
The fact that these men were detained and then released on police bail after about 24 hours, suggests that police were pretty sure that other lines of inquiry needed to be followed.
Image source, EPA/ShutterstockIf you're just joining us, here's a recap of what we've learned over the past 48 hours as police investigate the incident at RAF Fairford.
Marco Rubio says 'foreign actor' involved in RAF Fairford incident
US Secretary of State Marco Rubio has told Fox News network's "Hannity" programme that it was clear a "foreign actor" had been involved.
Without providing evidence or giving further details, he told the TV show: "I have to be careful, there are some things I cannot say on the air for a lot of different reasons. Suffice it to say, that what happened, what almost happened, what could have happened, in the UK over the weekend, is a very serious situation.
"It’s one that clearly involves the hands of a foreign actor."
"I won’t get into great detail about that yet. I do want to thank the authorities in the United Kingdom who have been very co-operative and on top of it.
"I know a lot of people are disturbed by the news that some of these people have been released on bail, some of the people are being investigated. Obviously we’re engaging with them on all of that.
"But suffice it to say, beyond that I would argue that they’ve been very co-operative and very helpful, on something that’s a very serious incident."
Good morning, we are resuming our live coverage of the major incident at RAF Fairford.
We have a reporter at the scene as local residents are now able to return home, the day after the five men arrested in the early hours of Sunday morning were released under investigation.
Gabriela Pomeroy
Live reporter
Image source, ReutersThe five men who were arrested on Sunday on suspicion of explosive and terrorism offences near the RAF Fairford military base have been released on bail, UK counter-terrorism police said this afternoon.
The men - who are all British - remain under investigation, "as we explore multiple lines of inquiry, the head of counter-terrorism policing, Laurence Taylor, told reporters.
Police are exploring whether proxies or individuals working on behalf of a foreign state were involved, he said.
The release of the five men sits at odds with our being told this was a "major incident," the BBC's Security Correspondent Frank Gardner writes.
A large cordon remains in place near the base, while 85 households who were evacuated on Sunday have now been told by Gloucestershire Police that they can return home.
Many questions remain unanswered about the incident, including how President Trump's comments on the matter relate to the developments.
The US president said on Sunday: "We had them under investigation. They were looking to do big damage.”
After the five men were released on Monday, Trump weighed in again, saying he wouldn't have let them out on bail.
We are ending our live coverage now but you can read our news story here.
Christopher Mace
Live page reporter
Earlier we brought you a picture appearing to show an open and unguarded gate and barrier at RAF Fairford, reportedly taken on Thursday 24 September.
We sent the image to the United States Air Force this afternoon and they have now issued a response:
"For operational security reasons we will not discuss specific force protection measures.
"The 501st Combat Support Wing remains vigilant and will take appropriate actions to ensure the safety and security of our US service members, civilians, contractors, and their families across the European theater."
They added: "We constantly assess a variety of factors that determine what measures we institute or modify to protect our installations, our people and their families."
Bernd Debusmann Jr
White House reporter
As we've reported, President Trump was briefly asked about the incident at RAF Fairford.
His answers, however, did not provide much clarity - other than to make clear he was surprised and perhaps somewhat dismayed the five men arrested on Sunday have been released on bail, and that he views the co-operation with UK authorities as "very good".
While Trump said that Iran "might" be linked to the incident, he declined to provide any further details on what makes him believe that.
Since the US began striking Iran in late February, the White House and Trump have repeatedly described Iran's government as one that has been linked to terrorist attacks on US targets, stretching back to the founding of the Islamic Republic and bombings and kidnappings that took place in Lebanon in early 1980s.
Notably, there seems to be a disconnect between what Trump is saying and what British authorities are saying regarding the incident, with Trump saying that "we know everything" about the suspects and police in the UK stating that this was not an intelligence-led operation.
Image source, EPASpeaking in the Oval Office, Trump says he wouldn't have let the five men arrested near RAF Fairford out on bail.
"I'm surprised they released them, I wouldn't have," he says.
"We know everything about them, we would not have released them."
He adds that the UK has been "very good" and has worked with the US "very closely".
Image source, Getty ImagesUS President Trump is currently speaking in the Oval Office - currently talking about domestic US matters - but we'll bring you anything he mentions on the RAF Fairford incident.
The incident is relevant to the US, as its air force operates out of the UK base, where its supersonic B-1 bombers are located.
Image source, UK PoolDefence Secretary Wes Streeting has praised the policing response as "exemplary" following the incident near RAF Fairford, and says the men released are "under stringent bail conditions".
Speaking from Liverpool, following a Cobra meeting chaired by Andy Burnham, Streeting says that ministers are "acutely aware" that the events have "caused considerable disruption to the local community and also wider public concern".
He adds: "The response of our policing, counter-terrorism policing, and security services has been exemplary."
Streeting says that decisions around bail are for the police, and tells the public that "those five individuals are under stringent bail conditions", adding that "we remain with a live investigation".
Image source, PAAnnouncing that evacuated residents are able to return to their homes, Gloucestershire Constabulary’s Temporary Chief Constable Maggie Blyth has thanked the community for its "continued support and assistance".
She says she knows the incidents of the last few days will have caused "anxiety and uncertainty", but adds the force is doing "everything we can to return your lives to normality".
Blyth reiterates that Counter Terrorism Policing are leading the investigation, and that there are many questions Gloucestershire Police "simply cannot answer".
She says the last 48 hours have thrown "our usually quiet and peaceful communities under the spotlight of the international media".
Blyth adds: "There have been some reports in the media that have raised questions about our response, and I want to reassure people we have responded appropriately and quickly to all calls."
Residents who were evacuated from around 85 homes near RAF Fairford because of a suspected plot to attack the airbase are now able to return home, Gloucestershire Police have said.
But police say a cordon remains in place around the three suspicious vehicles which were spotted near the military base in the early hours of Sunday morning.
People who were evacuated in the early hours of Sunday morning were taken to a nearby leisure centre which was set up for emergency respite.
Those who could not stay with family or friends were put up on Sunday night in hotels across Swindon and Cirencester.
Christopher Mace
Live page reporter
A driver has said he was "absolutely amazed" that when he drove past RAF Fairford on Thursday there was reportedly no security at the base's gate.
He shared rear-facing dashcam images which appear to show an entrance to RAF Fairford with its gates and security barrier open.
The driver told the BBC he drove past the entrance twice within 45 minutes and was "shocked" to see no visible security on either occasion.
"I could easily have walked onto or driven onto the base," he says.
"I was absolutely amazed that you've got active bombers in there and no security at the gate."
BBC Verify has confirmed the location shown in the image as being RAF Fairford, but said it was unable to validate claims that security personnel were not present. The image was recorded just days before the incident that is now the subject of an investigation.
We have approached the United States Air Force, which is stationed at RAF Fairford, for comment.
Leigh Boobyer
Live page reporter
A large police presence remains near RAF Fairford while counter-terror police continue with their investigation.
Some residents have been allowed to return to their homes this evening after being forced to flee early on Sunday morning.
Here's the latest photographs from the scene.
Officers have allowed some residents to travel through the cordon so they can return home
Image source, Reuters
Image source, Getty Images
Image source, Getty Images
Image source, PA MediaLeigh Boobyer
Live page reporter
Gloucestershire County Council councillor Dom Morris says he will put "drinks behind the bar" for the local community after this weekend's suspected terror plot displaced dozens of people.
“A big day for our community. Many were evacuated; some remain unable to get home, farm animals remain unfed,” he says.
“We are in shock. But we are a resilient bunch.
"Let's all look after each other like the local farmer who stepped up overnight on Saturday – for that I will be putting some drinks behind the bar."
Bea Swallow
Live page reporter
Long before this weekend's security scare put RAF Fairford in the national spotlight, the base was a battleground for public opposition to military action.
In March and April, hundreds of anti-war demonstrators gatheredoutside the gates to protest against the UK government's decision to allow American forces to operate from the Gloucestershire base.
Protesters argued that UK bases should not be used in another Middle East conflict and warned that the country risked being drawn deeper into a war with Iran.
Daniel Sandford
UK correspondent
The five men arrested on Sunday morning have all been released on police bail.
But detectives said they “absolutely” remain under investigation.
It means this case did not get to the stage where there was such major concern that the suspects had to remain in custody or be charged.
Whether these men were involved in some kind of activism or were acting unknowingly on behalf of a foreign state are still part of the investigation.
But we can probably rule out some enormous set of explosives being found in those vehicles.
There is still quite a lot of concern about what those men were doing so close to RAF Fairford in the early hours of Sunday morning, however this is not the plot some were fearing at the time of their arrest.
But that begs the question of how these developments fit with what Trump said about the arrests?
He told reporters on Sunday: "We had them under investigation. They were looking to do big damage to our fort.”
It's possible Trump was talking off the cuff, or that he was talking about something unconnected. We have seen security tightened up over the week around RAF Fairford, according to local residents.
But what involvement these men had in that seems to have got the point where it was so unclear that they have been released on police bail.
By Alex Murray
RAF Fairford has played a key role in US operations against Iran this year since then-Prime Minister Keir Starmer authorised the use of UK air bases for the "specific and limited defensive purpose" on 1 March.
6 March: The first B-1 bomber was pictured arriving at RAF Fairford.
Image source, PA Media10 March: US military personnel are pictured preparing munitions for four B-1s and three B-52 bombers which are at the base.
11 March: Verified footage posted on social media shows a flight of three B-1s taking off from Fairford the day before with B-52 bombers visible in the background.
Image source, Flightradar24A US Air Force B-1 bomber was seen in partial flight tracking making a round-trip to the Middle East
18 March: Partial flight-tracking data shows a B-1 previously seen taking off from Fairford made a near-16 hour round-trip to the Middle East.
19 September: Flight-tracking data shows a B-1 taking off from RAF Fairford and flying over central Europe before heading to the Atlantic and then returning to base.