Officials are searching for a man who jumped into the Detroit River.

Officials are searching for a man who reportedly jumped into the Detroit River early Thursday morning, a spokesman for U.S. Coast Guard Sector Detroit said.

The USCG was notified of the incident at 4:30 a.m. and immediately began a search operation, a spokesperson told The News.

Detroit sector officials sent a helicopter to assist in the search and refueled the plane before sending it out again just before 8 a.m.

USCG boats were also on the river searching near Belle Isle, along with Detroit Fire Department crews and Canadian Joint Rescue Coordination Center boats on the Canadian side of the water, the spokesman said.

The operation remained a life-saving operation Thursday morning, a spokesman said.

The Detroit Fire Department deployed a search and rescue boat to assist other agencies in the search, a spokesman told the Detroit News. Officials don’t know why the man jumped into the river.

Rescue efforts begin Thursday after Detroit fires saved man from the river last week.

According to Detroit firefighters, dispatchers received a 911 call around 3:30 a.m. Oct. 21 about a man in the river screaming for help. Rescuers successfully rescued the man and took him to the hospital.