State Police detectives were on scene on Monday afternoon after a body was discovered near the Neponset Greenway trail near Mattapan Square.

It was not yet clear if foul play is involved.

“Members of the Suffolk County State Police Detective Unit responded to an area near the Mattapan MBTA station at approximately 12:15 p.m. yesterday following the discovery of a body [along] the Neponset Bike Trail,” said Renee Nadeau Algarin, a spokesperson for DA Rachael Rollins, who characterized the probe on Tuesday as a “death investigation.”

“The cause and manner of death will be determined by the Office of the Chief Medical Examiner,” she said.