A large law enforcement presence descended on downtown Marine City, Michigan, on Sunday evening, April 12, 2026, following reports of a possible active shooter situation. Officers from Marine City Police and neighboring Cottrellville Township responded to the area shortly before 7:00 p.m. after receiving the initial alerts.
A shelter-in-place order was issued for residents and visitors in the immediate vicinity, specifically in the area of Union Street and South Water Street. A command post was established, and roads leading into the downtown district were closed as a precaution while officers worked to assess and contain the scene in this St. Clair County riverfront community.
Cottrellville Township officials issued public advisories urging people to avoid downtown Marine City entirely until an official all-clear was given . Witnesses reported a significant police presence, with officers actively searching the area amid concerns about an armed individual . Footage from the scene showed officers pointing rifles toward a building.
The situation remained active for several hours as law enforcement worked to determine the validity of the threat. The St. Clair County Sheriff’s Office stated that there had been “no confirmed victims” and that the shelter-in-place order was issued due to an “alleged active shooter”. A manager of Anita’s Riverfront Grille on South Water Street told reporters that customers were sheltering inside the restaurant.
The developing situation centered in the downtown district of Marine City along the St. Clair River, with police searching businesses and possible apartment areas in the vicinity . Marine City is a small community located about 50 miles northeast of Detroit, near the Canadian border, known for its riverfront location and local businesses.
By 8:00 p.m., officials confirmed that the situation remained active with no new changes, and residents and visitors were asked to continue staying away from the area. The Marine City and surrounding St. Clair County community has been left on edge by the developing incident, with residents expressing concern over the large police presence in the downtown area.
Authorities have not yet issued an all-clear as the investigation proceeds. Anyone in the area is urged to follow official advisories from Marine City Police and Cottrellville Township while law enforcement continues to assess the threat. The situation remains fluid as officers work to ensure public safety in this St. Clair County community.