Mystery drones spark 'uncertainty and fear'

Sightings at military bases, airports, a nuclear power station: a spate of unexplained drone flights has frayed nerves in Belgium and fuelled fears the country could be being targeted by Russia.

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Reports of drone activity at sensitive locations began to come out last month when drones were spotted near a number of military bases in the country.

Those sightings came as Europe was already on heightened alert after Russian drones were shot down over Poland and mysterious flights disrupted airports in Denmark and Germany.