Belgium's Brussels and Liege airports were closed on Tuesday evening after drone sightings, diverting many incoming planes and preventing others from taking off.

Kurt Verwilligen, a spokesperson for the Belgian air traffic control service, said shortly before 8 p.m. local time that a drone had been seen near Brussels Airport, which was then closed as a security precaution.

Belgium's busiest airport briefly reopened after two hours of disruption, but was closed again after more drone sightings. It was unclear when flights would resume.

National carrier Brussels Airlines said 15 outbound flights were unable to take off, while eight incoming flights were diverted to other airports. WATCH | Danish minister says drones are meant to cause fear:

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