New Delhi, Nov. 6 -- Dozens of flights at Belgium's main international airport were canceled on Wednesday after drone sightings overnight forced it to close temporarily, prompting Prime Minister Bart De Wever to convene a meeting with senior ministers to discuss safety concerns.

It was the first time that the airport in Brussels has been shut down by drones. It comes after a series of unidentified drone flights over the weekend near a military base where U.S. nuclear weapons are stored.

Brussels Airport said that 54 flights were canceled as a result of the Tuesday evening shutdown "for safety reasons" and apologized, saying that "the safety of our passengers and staff remains our top priority."

The airport operator said that about 400-...