A man was beheaded and at least one other person injured on Friday in a suspected Islamist attack on a gas factory near the French city of Lyon.According to sources, several small explosive devices were also set off at the Air Products factory in Saint-Quentin-Fallavier, BBC reported.The alleged attacker is said to have been carrying an Islamist flag, which was found nearby.A man has been arrested, officials said.Interior Minister Bernard Cazeneuve is on his way to the scene.Prime Minister Manuel Valls has ordered for tight security nationwide.According to earlier reports by The Local news portal, apart from the decapitated man, several others were also injured in the attack.