At least one person has died and several people were hurt after an attack on a factory near Grenoble, central France, on Friday.
French media are reporting that the man was decapitated and that the attacker was reportedly carrying an Islamist flag.
One person has been arrested, but it is not clear if that person is the attacker and no other details were available.
Bernard Cazeneuve, France's interior minister, is said to be on his way to the area. His office did not immediately a request for comment.
French security forces have been on high alert since gunmen attacked the office of French satirical magazine Charlie Hebdo in January, setting of several days of attacks across Paris.
French media report man decapitated in suspected 'Islamist attack'
French media are reporting that the man was decapitated and that the attacker was reportedly carrying an Islamist flag.
One person has been arrested, but it is not clear if that person is the attacker and no other details were available.
Bernard Cazeneuve, France's interior minister, is said to be on his way to the area. His office did not immediately a request for comment.
French security forces have been on high alert since gunmen attacked the office of French satirical magazine Charlie Hebdo in January, setting of several days of attacks across Paris.
French media report man decapitated in suspected 'Islamist attack'