Authorities say Rome's Fiumicino international airport is closed due to an overnight fire.

Italy's flagship Alitalia airline said in a statement Thursday that all departures have been canceled up to 2 p.m. (1200 GMT) and that only intercontinental flights will be allowed to land during that period.

Alitalia advised all passengers scheduled to fly during those hours not to come to the airport. Roads to the airport were closed.

Sky TG 24 reported that the fire, which broke out after midnight in the main international terminal, was under control and that it involved about 400 square meters (more than 4,000 square feet) of retail space. No cause was immediately identified. Images broadcast on Sky showed smoke still coming from the terminal in the morning.