PORT HURON, Mich. (AP) — Police divers were searching the Black River in Port Huron for two men reported missing in the waterway.

The St. Clair County sheriff's office says a man in a pontoon boat jumped into the river about 2:30 p.m. Wednesday after seeing another man in the water.

Both men disappeared beneath the surface. The Coast Guard tells the Times Herald of Port Huron that people on the pontoon boat and another boat in the area reported the incident.

The Coast Guard and Port Huron Fire Department were unable to find either man.

In addition to the dive team in the river, sonar was being used late Wednesday afternoon in the search.

Port Huron is about 55 miles (88 kilometers) northeast of Detroit.