The Highways Agency says it expects the A1 around Catterick garrison to remain closed until around 3pm.
Police have closed the A1 in both directions in North Yorkshire after reports of a possible explosion in the Catterick Garrison area.
North Yorkshire Police say a report was received at 3am Saturday after an explosion was heard in the Catterick area. There are no reports of any injuries at this time.
Both slip roads to Catterick have also been closed and diversions have been put in place.
Motorists are advised to avoid the area at this time.
A police spokesman says this is a precautionary measure while police conduct their enquiries.
North Yorkshire Police have released this e-fit image of a man suspected of indecently exposing himself to two young girls.
The incidents happened in Bedale on Saturday 28th June and then separately in Catterick on Sunday 29th June.
In both cases the suspect was driving a black VW Polo, or similar car, and is described as being aged in his late forties or fifties, with dark hair which is greying and a tanned complexion.
Detective Inspector Shaun Page said: "If you do recognise him, I urge you to come forward and contact the police immediately.
“If someone is identified and they are not responsible we will be able to quickly eliminate them from our enquiries.”
Detectives in North Yorkshire said they had received two reports of indecent exposure to young girls, which may involve the same man.
In the latest incident, the driver of a black VW Polo stopped on Mowbray Road in Catterick at about 12:30pm and indecently exposed himself to a young girl. He was described as having black or dark brown hair and was wearing square shaped glasses.
In the earlier incident, a man matching a similar description pulled up in a black VW Polo or similar-looking car on Benkhill Drive in Bedale and performed a "lewd act" in front in a 10-year-old girl. It happened at about 3:30pm on Saturday.
Neither girl was injured but both are said to be upset.
Police said a man had indecently exposed himself to a 10-year-old girl, close to a school, in North Yorkshire.
The man allegedly stopped near the girl on Benkhill Drive, Bedale, in a black Volkswagen Polo or similar-looking car, performing a "lewd act".
He did not try to touch the victim and she was not injured, before the car pulled away towards Fitzallan Road.
Officers want to trace a man in his 50s, with a tanned and wrinkled complexion and short black, greying hair.
He was wearing rectangular silver framed glasses and possibly a short sleeved top.
It happened on Saturday, 28th June at about 3:30pm.
North Yorkshire Police said it was believed to be an isolated incident.
Investigations are continuing into the cause of an accident in North Yorkshire in which two soldiers died. The car in which the man and woman were travelling hit a tree near Catterick Garrison on Saturday.
Catterick police are appealing for information following an assault in the town.
It happened at 2.30am on Thursday December 12 on Catterick Road, near Darlington College.
Two men from Catterick Garrison, aged 25 and 29, were assaulted by two other men. The victims received minor head injuries.
One of the men was taken to the Friarage Hospital in Northallerton for treatment.
The first suspect is described as a white man who is short and stocky, with short brown hair. He was wearing a navy blue jumper with white writing on front.
The second man is around 5ft 8in tall. He was wearing a zip-up hoodie with writing in the shape of a rainbow on the front.
Police investigating an assault in Catterick, which left two men injured, have released an image of a suspect they need to trace.
The assault happened around 3am on Friday November 8 in the Louis Bar nightclub in Kitchener Road.
A 27-year-old man from Catterick was knocked unconscious. He was taken by ambulance for treatment at the Friarage Hospital, Northallerton.
A 21-year-old friend of the victim, from Darlington, was also hit in the face when he intervened. He was treated by paramedics.
The suspect is described as a white man, aged in his late teens or early twenties with a slim build and short hair. When he left the bar he was with a number of other people.
Police are appealing for witnesses.
Hundreds of soldiers based at Catterick Garrison have attended York Minster after returning home from Afghanistan.
During their six month tour, nine soldiers from the 4th Mechanized Brigade died in service.
Watch the full report from Frances Read below: