A 10-year-old boy has been arrested on suspicion of manslaughter after a 47-year-old passenger died following a lorry crash in Kent .
Police said a group of young people was seen throwing stones at vehicles just before the lorry and a recovery truck crashed on the A20 on Saturday.
Michael Baker, 47, of Littlehampton in West Sussex, who was in the recovery truck, died in hospital.
The 10-year-old boy has been released on bail after being questioned.
A boy of nine has also been "spoken to" in connection with the incident.
Officers said a group of young people had been seen standing on the grass bank at the wooded side of the A20 near the Swanley interchange before the accident happened at 1100 BST.
As he passed the group, the lorry driver realised something had struck his windscreen and pulled over.
The recovery truck hit the lorry while it was stationary.
The driver of the recovery truck, who suffered a leg injury, is now out of hospital. The lorry driver was not hurt.
Earlier, a van driver travelling along the same section of the A20 reported that his windscreen had been smashed by a stone larger than a tennis ball.
Ch Insp Adrian Futers, the Sevenoaks district commander, said the young people had been standing at a problem spot.
"We frequently send patrols [there] because youngsters hang around and there have been previous reports of things being thrown at vehicles," he said.
This area is reached via an underpass from Laburnum Avenue on St Mary's estate.
House-to-house inquiries were carried out the area and a mobile police station was set up.
Police are continuing to appeal for witnesses who can help their investigation.