The body of a 17-year-old missing swimmer was recovered by firefighters off Shannon Beach in Winchester Saturday evening, according to Massachusetts State Police.

The missing teenage swimmer was roughly 100 yards offshore with a group of other swimmers when the others realized he fell below the surface. The teenager’s body was found by Stoneham and Winchester firefighters in approximately six feet of water near where he was last seen by the other swimmers, police said.

The Massachusetts State Police patrols, specialized units and detectives responded to Shannon Beach Saturday night, along with the Massachusetts Environmental Police, officials said. Officials received calls about the missing swimmer at approximately 7 p.m.

The investigation into the teenage swimmer’s death is active and is being spearheaded by the state police’s Detective Unit for Middlesex County, according to officials.