BRUSSELS (Reuters) -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.

Drones have caused major disruption across Europe in recent months, forcing temporary closures of airports in several countries. Some officials have blamed the incidents on “hybrid warfare” by Russia. Moscow has denied any connection with the incidents.

Brussels airport, Belgium’s busiest, was closed at around 8 p.m. (1900 GMT) after three drones flew over the airport’s perimeter, Belgian air navigation service Skeyes said.

At around the same time, drones were spotted over the airports in Antwerp, Liege and Ostend, forcing

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