Unknown drones were spotted in the sky over facilities in several cities in the federal state of North Rhine-Westphalia in western Germany, according to Der Spiegel magazine, Report informs via TASS.

According to their information, on the evening of January 13, several drones were flying over an industrial park in the city of Marl. They were noticed around 20:15 by facility security, who informed the police.

When law enforcement arrived at the scene, the drones were still in the sky. UAVs were also spotted over the Bundeswehr ammunition depot in Dorsten, and over facilities in Bochum, Oberhausen, and Essen.

According to the publication, investigators do not consider the appearance of UAVs in different locations in the region to be coincidental. However, they have not been able to identify the persons who launched them.