Belgium's Liege airport has temporarily halted flights for the second time in a week due to a drone sighting, the country’s air traffic control service has said.

The disruption comes three just days after drone sightings in the capital Brussels and in Liege forced the diversion of many incoming planes and the grounding of some due to depart.

Sightings of drones over airports and military bases have caused major disruptions across Europe in recent months. Authorities in some countries have linked Russia to the incidents, saying they form part of Moscow’s “hybrid warfare” campaign against Europe. Moscow has denied any connection to the incidents.