Drone sightings closed the Nordic region’s two biggest airports for up to four hours as anxiety mounted across Europe about a series of violations of airspace by unmanned and manned aircraft.
因发现无人机，北欧地区两大主要机场关闭长达四小时。此前欧洲多地接连发生无人驾驶与有人驾驶航空器入侵领空事件，引发广泛担忧。
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