A suspicious drone was reported flying over the Sako arms factory, hospital, and rescue service areas in Riihimäki, Finland, on the night of February 4-5, 2024. The drone was observed by eyewitnesses and reported to local police and Traficom. Flying drones over the Sako factory is prohibited without permission except for state or Defense Forces use. Authorities have not launched an investigation but continue to monitor drone activity near critical infrastructure.

On the night between February 4 and 5, 2024, a suspicious drone was seen flying over the Sako arms factory, the hospital, and the rescue service areas in Riihimäki, Finland. Eyewitnesses reported the drone to Häme police and the Finnish Transport and Communications Agency (Traficom). The observed drone was described as large. Flying drones over the Sako factory is prohibited unless authorized by the company or relevant authorities, with exceptions for the state and Defense Forces. The police did not dispatch a patrol as the report came after the sighting and do not currently know who operated the drone or the purpose behind its flight. The incident was documented in a joint database to analyze drone sightings. Finnish authorities have noted an increase in drone activity near critical infrastructure since 2022 and encourage public reporting of such sightings. Traficom added the Sako factory area to the official no-fly maps after initially missing it. Local officials continue monitoring drone activity but consider this event possibly civilian or hobbyist-related. No formal criminal investigation has been initiated by the police.