Update: 3:15 p.m.

From the District Attorney's office: "State Police assigned to the Suffolk DA’s office are investigating the death of a man whose body was recovered from the Charles River early this afternoon.  The investigation thus far suggests that the deceased, an adult male, intentionally entered the water from the area of a boat launch near Storrow Drive and the Longfellow Bridge a short time earlier.  The preliminary evidence does not suggest foul play and the death is currently being investigated as a non-homicide."

Update: 1:28 p.m.

The Boston Fire Department divers have recovered the body of an adult male about 10 feet from the dock by the Hatch Shell. They've canceled the remainder of the dive team.

Update: 1:22 p.m.

Two divers are in the water now and the Fire Department Chief wants more divers ASAP. Witnesses on scene report they saw a person jump into the Charles River and not come back up from the water.

1:04 p.m.

Boston Police are responding to a report of a drowning in the Charles River off of Mugar Way by the Hatch Shell on the Charles River Esplanade. 

A dive team from the Boston Fire Department has been activated, and making its way to the Esplanade via Storrow Drive.

This story will be updated as more information becomes available.