Authorities combing the Yonne region in Burgundy for the attackers . A police official says no one was injured in the attack 1993 . The two vans were found burned in a forest near the site of the attack . The robbery took place on the A6 highway connecting Paris and Lyon . Gang used gas to force security personnel out of their vehicles . Police said that the robbers were 'heavily armed and battle-hardened '
Authorities combing the Yonne region in Burgundy for the attackers . A police official says no one was injured in the attack early Wednesday . The two vans were found burned in a forest near the site of the attack . The robbery took place on the A6 highway connecting Paris and Lyon . Gang used gas to force security personnel out of their vehicles . Police said that the robbers were 'heavily armed and battle-hardened '