New York City officials issued safety warnings Tuesday following reports of people entering the city's sewer system through manholes in recent days.

Videos and sightings have shown groups of people emerging from and entering the city's underground infrastructure at various locations. The incidents have prompted questions from residents and drawn the attention of local authorities.

City officials characterized the sewer system as extremely dangerous for unauthorized entry. The vast underground network poses significant safety risks to anyone attempting to explore or traverse the tunnels without proper training and equipment.

The motivations behind the reported sewer entries remain unclear. Officials did not provide details about the number of incidents or specific locations where the activity has been observed.

Authorities warned potential imitators against attempting similar activities, emphasizing the serious hazards present in the city's subterranean infrastructure. The sewer system was not designed for public access and contains numerous dangers for untrained individuals.

Investigators are looking into the reported incidents as city officials work to understand the scope and nature of the underground activity.