An illegal migrant who hid under a truck travelling from France has been killed trying to disembark while the vehicle was stationary on the M25.
Metropolitan Police said the victim was one of two men thought to have climbed under the lorry at Calais. The vehicle took the Eurostar to England, then headed towards London.
Police want to track down the truck driver, who failed to stop.
A police spokesman said the men had "become extremely cold and decided to leave the lorry".
"While the HGV was stationary in lane one of the motorway, one of the men worked himself free and clambered down the nearby grass verge.