MOSCOW (Reuters) - Russia's transportation watchdog said on Tuesday that the plane in which the head of French oil major Total, Christophe de Margerie, was killed in a Moscow airport late on Monday crashed in "bad visibility". Rostransnadzor also said it had started investigating the accident at Moscow's Vnukovo Airport, where the private jet collided with a snow plough as it was taking off. (Reporting by Gleb Stolyarov; Writing by Vladimir Soldatkin; Editing by Alexander Winning)