Motorists have been facing heavy delays after two separate incidents on the A19 this morning.
An incident involving four cars took place just after the A690 junction on the southbound section of the road.
One person was taken to hospital with minor injuries, and all lanes have since been reopened.
A separate collision happened on the northbound section of the road, with three vehicles involved in it just after the B1283 Easington junction.
Emergency services have been at the scene of both incidents.
The fire service has closed the A19 at the site of the southbound collision, according to reports, with traffic now being diverted onto the A690.
Traffic is thought to be backed up as far as Testos roundabout, while there is also heavy traffic on the A690, stretching back towards Sunderland.
An eye-witness said: "It looked like a very serious incident.
"There were four, but probably at least five, cars involved.
"One was in the central barrier and fire crews were cutting the car up to get someone out.
"I saw two ambulances and at least five firefighters, and another two ambulances going up to the scene.
"Behind the car that was being cut up was a lot of debris."
A spokesman for North East Ambulance Service said: "We were called at 7.55am to reports of a four-vehicle road traffic collision just south of the A690 junction on the A19.
"We sent two hazardous area response team vehicles, a cardiac arrest car and a crew.
"One patient was taken to Sunderland Royal Hospital with minor injuries.
"Fire and police were also in attendance."
A Northumbria Police spokesman said: "At 9.05am this morning police responded to a report of a collision on the A19 near the A690.
"There are currently reports of tailbacks on the road.
"It is not believed anyone is seriously injured."
A spokesman for Tyne and Wear Fire and Rescue Service said: "We have three crews in attendance: one from Farringdon, one from Rainton Bridge and one from Sunderland Central."
The northbound incident also led to severe traffic through East Durham, with several miles of tailbacks.
A North East Ambulance Service spokesman said of that incident: "We were called at 9.18am to a road traffic collision on the A19 southbound.
"We sent our hazardous area response team but were stood down on scene."
More to follow.