One person is thought to have died after two planes crashed in the air near Shoreham Airport in West Sussex.
A light aircraft crashed into nearby Adur Recreation Ground but the second aircraft involved landed safely.
Police said it was thought one person had died in the incident at about 1630 BST on Monday but that no-one on the ground had been injured.
A volunteer worker at the airport said the planes collided shortly after one of them had taken off from Shoreham.
“A plane had taken off from Shoreham and was heading out to sea and another one was coming west to east,” he said.
“The one that was coming from west to east came straight across the front of the one that had taken off.
“I saw the wing hit the other one and a lump fell off.
“That aircraft actually managed to land again but the other one – it was just awful.
“It came straight down and a plume of black smoke went up.”
Police have put a cordon around the wreckage at Adur Recreation Ground and at Beach Green.
The A259 has been closed in both directions and diversions are expected to be in place for some time.
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