Larger “mother drone” over Kiel Fjord / harbour area

On the night of 25-26 September 2025, a coordinated wave of drone sightings was reported over Kiel and other parts of the German state of Schleswig-Holstein, concentrated on critical infrastructure around the Kiel Fjord. According to internal security documents cited by German media, two small drones first appeared shortly after 21:00 on Thursday over the TKMS submarine shipyard (the naval division of thyssenkrupp). Shortly afterwards a formation described as a "drone swarm with mother drone" (Drohnenverbund mit Mutterdrohne) was observed over the University Hospital, and around 22:00 a similar formation appeared over a gas power plant on the Kiel Fjord and the Kiel Canal.

Central to the reports is a larger so-called "mother drone" (Mutterdrohne): observers reported a large, stationary drone over the Kiel Fjord accompanied by several smaller craft, apparently operating in coordination. Other sightings were reported over the state parliament building (Landeshaus), government buildings and the Heide oil refinery. Reports indicated the drones flew in parallel paths, seemingly to precisely measure the facilities on the ground. Interior Minister Sabine Sütterlin-Waack confirmed to a state parliament committee that flying objects of "various types and sizes" had been observed, and the chief public prosecutor opened an investigation against unknown perpetrators. The "mother drone" element is presented as a reported observation, not an independently confirmed fact.

The mother-drone account is a reported observation and preliminary assessment drawn from witness reports and internal security memos, not an independently verified fact. The apparent coordination, parallel flight paths and focus on a shipyard, power plant, hospital and government sites are consistent with reconnaissance, prompting authorities to investigate suspected espionage and sabotage. Attribution remains unknown and under investigation; no perpetrator has been confirmed. The incident fits a broader, hedged pattern of drone activity over European critical infrastructure in late September 2025, including in Denmark, but a direct link to any state actor has not been established.