ROBBERS smashed into a car before fleeing with £100,000 worth of jewellery.
They rammed into a silver VW Polo being driven by two jewellery traders near Winscar Reservoir in Dunford Bridge.
A gang of men got out of the red Rover car, smashed the window of the Polo, which had hit a wall, and stole £4,000 worth in cash as well as the valuables.
Barnsley police are appealing for information about the terrifying attack.
It happened about 11.30am on Saturday, but details emerged only yesterday.
The area around Dunford Bridge is popular with walkers and with families and police are trying to trace anyone who was in the area at the time.
A police spokeswoman said: "If anyone witnessed this, it wasn’t just a road traffic collision.
"The information they can provide could be vital in the investigation."
Any witnesses are urged to contact police on 01226 736030.