Essex police have arrested two lorry drivers on suspicion of dangerous driving following a multiple pile-up on the M25 near Lakeside.
One person was killed and five more including a child were taken to hospital following the crash involving three lorries and five cars.
The collision happened between Junctions 29 and 30 shortly before 12:30pm. A section of the clockwise carriageway has been closed with traffic being diverted off and back on the motorway. The road is expected to be closed until later on Tuesday evening.
More top news
More than 1,000 packets of illegal cigarettes have been discovered in a series of raids in Northamptonshire.
An angry shopkeeper who poured water over a street entertainer's stereo has made amends by giving him a replacement.
The Prince of Wales and the Duchess of Cornwell have toured the Sandringham Flower Show on the Queen's Norfolk estate.