We can now bring you further details from Counter Terrorism Police.

Deputy Assistant Commissioner Vicki Evans says they are in the "early stages of an investigation, and five men remain in custody".

Counter Terrorism are "working closely" with partners to "understand the circumstances of the incident", she says.

She adds: "We continue to work with Gloucestershire Police to keep the community safe as we work to gather evidence from the scene."

Repeating details shared earlier, she says a 400m cordon is in place around the vehicles while the Army's Explosive Ordinance Disposal unit carries out examinations, and 85 households have been evacuated.

Counter Terrorism Police say the five men have now been further arrested on suspicion of preparation of a terrorist act.

We'll bring you more on this shortly.

Image source, POOL

We've just received an update from Gloucestershire police following a major incident near RAF Fairford.

Here's what we learnt:

• Five men were arrested on suspicion of committing offences under the Explosives Act and remain in custody
• The force received a call at about 00:45 BST relating to "three suspicious vehicles" travelling toward RAF Fairford
• A 400m cordon is in place around the vehicles while they are being examined, with 85 households evacuated
• Ocone said work is ongoing to establish the full nature of the incident, with the force working alongside counter-terror police

Assistant Chief Constable Richard Ocone finishes by stressing the police's focus is on the local community.

He thanks residents for their co-operation in evacuating, and says he appreciates the disruption this has caused.

"I would like to reassure them that we are working as quickly as we can to get them back into their properties," he adds.

Ocon then asks the public not to speculate about the incident.

That brings the brief news conference to a close.

Image source, Reuters

Assistant Chief Constable Richard Ocone says that work to establish the full nature of the incident is ongoing.

He says the force is working closely with its partners in counter-terrorism policing.

He adds that a 400m cordon is in place around the vehicles while examinations take place.

Eighty-five households have been advised to evacuate with a leisure centre open to house those unable to stay with family or friends.

Assistant Chief Constable Richard Ocone now says five men were arrested on suspicion of committing offenses under the Explosives Act.

They were taken into custody where they remain, he says.

Image source, Reuters

We've just heard from Gloucestershire police assistant chief constable Richard Ocone, who says the force received a call at about 00:45 BST on Sunday morning relating to "three suspicious vehicles" travelling toward RAF Fairford.

A woman who has lived near RAF Fairford for the last 50 years says there has been an increase in military security in recent weeks.

She told the Press Association that "very heavy vehicles" had been put across all gates, with "great big concrete walls” also placed behind some gates, including on Dunfield Loop and Whelford Road.

Image source, Getty Images

Police have been responding to the major incident since the early hours of this morning, with nearby Fairford Youth Football Club, on Horcott Road, impacted.

Posting on its Facebook page, the club said today's games had been postponed "due to circumstances beyond its control".

The post said: "Please don't head to the club."

Image source, Getty Images/Justin Tallis

Image source, Getty Images/Justin Tallis

Image source, Getty Images/Leon Neal

One resident who has lived in the area for 18 years said she was woken by police banging on her door.

She was then ordered to leave straight away, without being able to take her dog with her.

Jo says she knew it "must be serious" after she was evacuated from her home at about 07:00 BST.

"We were asleep and they were just banging on our door.

“They said it was a critical incident and we’ve got to leave straight away, and they basically wouldn’t leave the doorstep until we left.

“We just had to throw our clothes on and come. We didn’t know anything.”

Jo says the police waited at the door until they left.

“I didn’t even brush my teeth or nothing."

Jo says she had to leave her dog, Coco, after the rush.

“They just implied that we shouldn’t take him. We fed him, but it’s not about that, is it, it’s just he’s on his own for hours.”

The police news conference on the RAF Fairfield incident, which was due to start at 12:45 BST, has evidently been delayed.

Our reporters are waiting for a spokesperson for either Gloucestershire or counter-terror police to arrive. We will update you when we hear more.

Jonathan Beale
Defence correspondent

A British Army bomb disposal team – known as an Explosive Ordnance Disposal team – is still carrying out operations, according to a defence source.

Pictures from a news helicopter show a remote controlled robotic system being used to inspect a number of stationary white vans in the area.

A defence source said UK Military Police were also supporting their civilian counterparts in providing a security cordon around the area.

Leigh Boobyer
Live page reporter

While we wait for police to give an update on the major incident - here are how things look on the ground.

Image source, PA Media

Armed police are placed on roads around RAF Fairford while investigations continue

Image source, Reuters

Some residents in the village have been evacuated to a leisure centre and have not been told when they can leave

Image source, Reuters

Emergency services have been positioned in and around the village since the early hours

Image source, PA Media

Counter-terrorism police are leading the investigation

Image source, PA Media

Gloucestershire Police say several men had been arrested on suspicion of offences under the Explosives Act.

While we wait for police to give us their update, the cordon, which has been in place since the early hours of this morning, has been expanded to include RAF Fairford.

Our reporter Alastair McKee says everyone has been moved out of the vicinity of the air base and into the village further down the road.

We're expecting to hear an update from authorities shortly.

You'll be able to watch live at the top of the stream when the conference gets under way.

We'll bring you all the key news lines here, too.

Image source, Reuters

A Whelford resident has described the moment he saw police apprehend the suspects.

Jeff told the BBC that he heard "shouting outside his front door", although he couldn't be sure where it came from.

He says he then looked out of his window and saw "people being held by police outside".

The moment was "a bit surreal", he says, but adds that "you get used to funny things going on sometimes around the base [RAF Fairford]".

Helicopter footage taken near RAF Fairford has shown a wheeled robot operating near three parked white vans.

Earlier, Gloucestershire police said the Army's specialist explosive ordnance disposal team is examining a number of vehicles in the village of Whelford.

The force has not confirmed which vehicles were being examined, or mentioned the use of a robot.

A resident evacuated from his home near RAF Fairford in the early hours of Sunday says three "unusual vans" appeared in the area overnight.

Julian Tudsbery claims footage recorded by doorbell cameras in the area since the evacuations has shown "some robots looking in the back of these vans".

He says: "There were these three vans that arrived in the middle of the village and a resident reported them to the police straight away."

Police have not made any mention of vans or the use of robots.

Annabelle Martin
Reporter

Jason, an evacuated resident who has been at the leisure centre since about 7am, told the BBC that he was first made aware of the incident after seeing "some messages on the village group" last night.

Jason says he heard the helicopter but went to bed as normal before being woken by police officers.

"It all happened very quickly. We just packed our stuff up and came here."

He says the police described the situation as a "major incident" and had given residents "basic updates".

Jason says he had to bring his ill cat with him, that was supposed to be heading to the vets today.

He says: "It's been a bit full on. A bit eventful."