Belgium will work to improve surveillance of its airspace following repeated sightings of drones over its airports and military bases, Defence Minister Theo Francken said on Thursday. Belgium's Brussels and Liege airports were closed for hours on Tuesday evening after drone sightings,

Belgian intelligence services believe Russia is behind a series of drone flights detected in recent weeks over military bases and airports.

Belgium’s defense minister says a number of drone flights over the weekend near a military base where U.S. nuclear weapons are stored could be part of a spying operation.

Belgium called an emergency meeting of key government ministers and security chiefs for Thursday after drone sightings forced closures of airports and a military air base on Tuesday evening in what the defence minister called a coordinated attack.

Unidentified drones were spotted over a Belgium military base housing U.S. nuclear weapons, sparking security concerns and an investigation into a potential spying operation.

Belgium's defense minister said that more counter-uncrewed aerial systems "are urgently needed" after three drones spied on the Kleine-Brogel base.