The latest on the attack in southeastern France (all times local):

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11:30 a.m.

A French security official says an attack and explosion at a gas factory in southeastern France has left one person dead.

The official, who spoke on condition of anonymity because she wasn't authorized to talk to the news media, said the dead person was found decapitated outside the entrance to the factory.

France's top security official was rushing to the scene. The official said two attackers arrived in a car, bearing banners written in Arabic, and set off an explosion. One of the attackers was arrested.

— By Lori Hinnant