BOSTON (WPRI) — Massachusetts State Police (MSP) have recovered the body of a 4-year-old boy who went missing Sunday night in South Boston.

Courtesy: Massachusetts State Police

A search team found the body of Mohamed Abou Fofana around 12:30 p.m. Monday on the shoreline of Spectacle Island, across the water from Castle Island, according to police.

Mohamed was playing at a Castle Island park under the care of an adult family member on Sunday, police said. He was reported missing around 7:30 p.m.

Mohamed’s mother said he had autism and was nonverbal. She told reporters she received a call from her father who told her he couldn’t find Mohamed.

Search teams spent hours looking for the boy from the ground, in the air, and in the bay. State police said they reviewed surveillance video in hopes of finding out where he left the playground area.

“At one point last night however we did find a blue Croc-type sandal which about thirty yards offshore which lent credence to the theory that Mohamed may have entered the water and may have drowned,” MSP Spokesperson David Procopio said.

The incident remains under investigation. No word yet on a cause of death.