A police official says 15 armed assailants attacked two vans carrying millions of euros worth of jewels on a French highway, ejected the drivers and drove them away.

Authorities are combing the Yonne region in Burgundy southeast of Paris and surrounding areas for the attackers.

The police official says no one was injured in the attack early Wednesday, and the drivers of the two vans were left at the scene unharmed. The official says the two vans were found burned in a forest near the site of the attack, which happened on the A6 highway connecting Paris and Lyon. The jewels were not found.

The official spoke on condition of anonymity because he was not authorized to be publicly named.

No other details were immediately available.