More than a dozen armed men stole millions of dollars worth of jewels from two high-security trucks on a motorway south of Paris overnight, a French police official said on Wednesday.
The robbers held up the trucks at a toll payment station in the Yonne area and drove off in four cars.
Local media said the jewels were worth $9.5m and that the gang used gas to force security transport personnel out of their vehicles.
Nobody was injured in the attack and the trucks had been found burnt out, the police official said.