GRAND RAPIDS, Mich. (WOOD) — Authorities say a fisherman came upon a body in the Grand River in Grand Rapids Friday morning.

Emergency crews were called to the river under the Bridge Street bridge around 7:30 a.m. There, they pulled the body of a man from the water.

The Grand Rapids Police Department says investigators know who he is because they found some of his belongings on his body. They said he is a 41-year-old, though his name was not immediately released pending notification of family.

Police don’t know how long the body was in the water.

“Water has a way of altering the body a little bit the longer that it’s there. So as of right now, we’re leaving that up to the medical examiner’s office,” GRPD Capt. Terry Dixon said.

The ME would also determine the cause of death. Dixon hoped to know more within a few days.

Dixon said police were looking at “all possibilities” regarding how the man died and wound up in the river.

“As of right now, the detectives are going through all the evidence. They’ve conducted a canvass of the area and have talked to witnesses and they’re conducting follow-up interviews with other witnesses…” he said.

Anyone with information is asked to call GRPD detectives at 616.456.3380 or Silent Observer at 616.774.2345.