Two major Belgian airports were forced to close for hours on Tuesday evening following reports of drone sightings.
All flights departing or arriving at Brussels Airport, the country's busiest, were ground to a halt at around 7pm after a drone was seen.
The airport briefly reopened one hour later, before closing its doors again shortly after another suspected drone was spotted.
Brussels Airport released a statement shortly after the sightings, which read: "There are currently no departing or arriving flights at Brussels Airport due to drone sightings around the airport.
All flights departing or arriving at Brussels Airport were ground to a halt
|REUTERS
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"We monitor the situation closely and will provide updates as soon as we have more information."
Liege Airport, mainly used as a major cargo hub, also ground departures to a halt and diverted incoming aircraft after reporting the presence of drones in the area.
It remains unclear when flights will resume.
Belgian air traffic control has said there is currently "no evidence to establish a link" between the sightings in Brussels and Liege.
The airport briefly re-opened one hour later, before closing its doors again shortly after another suspected drone was spotted
|REUTERS
A second Brussels airport, South Charleroi, also temporarily shut its airspace for arrivals, impacting six flights including two operated by Ryanair.
Two Belgian airbases, Kleine-Brogel and Florennes, also reported drone sightings on Tuesday evening.
Florennes Mayor Antonin Collinet told local media that an investigation was underway after airbase personnel and police officers spotted a wave of "bright lights in the sky".
Belgium's Minister of Security, Bernard Quintin, called on Prime Minister Bart De Weve to convene an emergency meeting of the National Security Council in response to the sightings.
Belgium's Minister of Security, Bernard Quintin, called on Prime Minister Bart De Weve to convene an emergency meeting
|GETTY
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Mr Quintin said: "We cannot accept that our airports are disrupted by unauthorised drone flights.
"This requires a coordinated and national response.
"The Interior Ministry is in constant contact with aviation authorities, the Ministry of Defence, and the federal police to track the situation, assess risks, and prevent further incidents."
Defence Minister Theo Francken told local media that the incident appeared to be carried out by professionals trying to destabilise the country.
The sightings follow a wave of drone disruptions at major European airports in recent months.
In September, Oslo Airport and Copenhagen Airport were plunged into chaos for hours after drones were sighted by air traffic control.
Suspected Russian drone incursions have also been reported in Polish and Romanian airspace in recent weeks.
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