BERLIN (AP) — German authorities are investigating claims that unidentified drones may have spied on critical infrastructure in the northern state of Schleswig-Holstein, officials said Wednesday.

Multiple drones were spotted on Sept. 25 over a power plant in the state capital of Kiel, as well as near a university hospital and a shipyard in the port city, according to a Der Spiegel report.

Regional Interior Minister Sabine Sütterlin-Waack told a committee of the state parliament on Wednesday that flying objects of “various types and sizes” had been spotted. Chief Public Prosecutor Stephanie Gropp said an investigation was under way.

The sightings come as many NATO countries, including Germany, are on high alert following a series of recent incidents. Polish forces shot down Russian drone

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