The new fire in the tunnel closed for two months this summer after a deadly blaze was quickly brought under control, police said. No one was injured.
The tunnel was shut to traffic June 4 after two truck drivers, both from Slovakia, were killed in a fire thought to have started after a tractor-trailer carrying tires from France to Italy burst into flames inside the tunnel. It reopened in early August after safety inspections.
The 13-kilometer (eight-mile) tunnel links Modane, France, and Bardonecchia, Italy.