The main airport in Belgium's capital is expected to resume normal operations on Wednesday, after halting around 80 flights following suspected drone sightings, Ariane Goossen, a spokesperson for Brussels Airport, said.
Between 400 and 500 passengers had to spend the night at Zaventem airport because of the sightings, Goossens said.
"The situation will return to normal during the day", as flights restart, she said.
On Tuesday night, air traffic was also halted as a precaution at the second-largest airport Charleroi, operators there said.
Skeyes, the company responsible for air traffic control in Belgium, halted flights twice on Tuesday night, around 8:00pm (19:00 GMT) and around 10:00pm (21:00 GMT), after suspected drones were seen near Brussels-Zaventem and Liege airports.
The interruptions come after a recent spate of mysterious drone incidents targeting airports and sensitive military locations in several European countries, including Germany and Denmark.
Suspicions have swirled over potential Russian involvement in increased drone activity across Europe, with tension high as the war in Ukraine drags through its fourth year.
Over the weekend, Belgian authorities reported drone activity over the Kleine-Brogel military base, where a number of US nuclear weapons are believed to be stored.
Read moreFlights resume at Berlin airport after suspension over drone scare
Belgian military intelligence said it was conducting an investigation into the sightings.
Defence Minister Theo Francken on Monday refused to point the finger at Russia, but said that it appeared to be a coordinated operation carried out by "professionals".
"They are trying to sow panic in Belgium," Francken told local media. "This is destabilisation."
(FRANCE 24 with AFP)
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