Passengers wait in line at a service desk at Brussels Airport after the Belgian air traffic control service reported a sighting of a drone, in Zaventem, Belgium, on Tuesday. Yves Herman/Reuters BRUSSELS Reuters —

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 (2 p.m. Eastern time) 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.

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