There are a major delays on the M11 in Essex after a multi-vehicle crash.
The accident happened on the northbound carriageway between junction 7 for Harlow and Junction 8 for Bishop's Stortford.
Police and the air ambulance have been called to the scene and traffic is being held while they deal with the scene.
Highways England say the congestion is likely to remain until mid afternoon.
The southbound carriageway was also closed so the air ambulance could land.
There are fears people trapped in the traffic jam will miss flights at Stansted and there have been reports of people leaving cars and walking along the carriageway to get to the airport.
German police said no explosives were found on board a Stansted-bound easyJet flight from Slovenia that was diverted when the pilot was alerted to a "suspicious conversation" with "terrorist content".
Three British men were arrested after the flight was diverted to Cologne-Bonn Airport in Germany yesterday afternoon. They have since been released.
A backpack belonging to the men was blown up by police, but wasn't found to have contained explosives.
All 151 passengers on board were evacuated from the plane down emergency slides
Flights were suspended at the airport for three hours and passengers only arrived back at Stansted this afternoon.
A terror suspect who was arrested at Stansted Airport has appeared in court.
Somalian-born Aweys Faqey, of north London, is charged with preparing acts of terrorism after he was arrested on May 23.
Faqey has lived in the UK since 2013. He has a wife and give children in the Netherlands, and a wife and child in Kenya.
He has been remanded into custody.
A 'disruptive passenger' has forced a Stansted-bound flight to be diverted to Austria.
The flight from Bulgaria stopped in the Austrian city of Linz and a 46-year-old Bulgarian national was handed over to police.
Austrian state broadcaster ORF say the disruption was 'alcohol-related'.
The aircraft landed normally and the passenger was removed and detained by police upon arrival, before the aircraft continued to London Stansted shortly after.
We will not tolerate unruly or disruptive behaviour at any time and the safety and comfort of our customers, crew and aircraft is our number one priority.
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The snow ploughs at Stansted could well be called upon as the wintry weather reaches the Essex airport.
ITV News Anglia viewer Zoe Walker tweeted a photo of a car park where vehicles are gradually turning white.
She said: "Coming down thick and fast at Stansted Airport."
The snow may not have touched down yet - but Stansted Airport is already prepared.
These snow ploughs could be called into action later today if forecasts of the white stuff prove correct.
This morning, the Met Office updated its yellow weather warnings for snow and ice in the Anglia region on Thursday, Friday and Saturday.
It is warning East Anglia could see disruption to road, rail and air services as well as interruptions to power supplies.
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Stansted Airport say they are working to minimise disruption for Christmas passengers following the announcement of strikes by Swissport workers.
More than 1,500 check-in staff, baggage handlers and cargo crew at 18 airports will strike for 48 hours.
Members of Unite employed by Swissport will walk out on December 23 and 24.
A Stansted Airport spokesman said: "We are aware of this potential action and are contacting the airlines which use Swissport to understand their contingency plans to minimise any disruption were the strikes to go ahead."
Luton Airport is also looking into contingency plans for the strike.
"We are assessing the likely impact of the potential action and discussing contingencies with our relevant airline partners and Swissport in order to ensure passengers face minimal disruption should the strikes go ahead".
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