A man was killed by a train in north London moments after running from a car that was being chased by police.
The victim, thought to be 20, was hit on the tracks near Enfield Lock level crossing, Enfield, just after 1730 BST.
A short time earlier officers had been following a car which stopped at the crossing where the barriers were down, and three men got out, police said.
One climbed over the barriers and was hit by a north-bound train. Two men, aged 21 and 22, were arrested.
A Metropolitan Police spokesman said officers had been pursuing a Mercedes CLK in Ordnance Road for a "few hundred yards".
He said: "The vehicle failed to stop and made off. A short distance later the vehicle stopped at Enfield Lock level crossing where the barriers were down."
He said two men were arrested after leaving the vehicle at the crossing.
A third person in the vehicle was killed after walking on to the railway tracks as he fled.
The spokesman said: "He did climb the barriers and went on to the train track.
"A short time later, he was hit by a north-bound train. We do not know the identity of the deceased at this stage."
Reg Walker, a member of the public, arrived at the scene five minutes after the incident.
He said: "There was a silver Mercedes stopped in the middle of the road with the bonnet virtually touching the crossing gates.
"There was a police van on one side and they were putting a man into the van.
"The gates were down at the time."
Mr Walker said the victim died at a spot out of sight of the crossing.