Germany’s Der Spiegel magazine has reported that drones have been spotted flying over the US air base in Ramstein, sparking concerns about security and potential espionage. The sightings were not limited to the air base, as drones were also seen hovering over facilities belonging to the Rheinmetall arms manufacturer.

The incidents come on the heels of increased tensions between the US and other countries, including Russia and China, which have been accused of using drones for espionage purposes. The US air base in Ramstein is a key military installation in Europe, serving as a hub for US Air Force operations in the region.

According to Der Spiegel, the drone sightings were reported by multiple sources, including German security officials and employees of the air base. The magazine did not provide further details about the type of drones or their possible origin.

The incident has raised concerns about the security of the air base and the potential for espionage. The US military has not commented on the incident, but officials are reportedly investigating the sightings.