Montgomery County police have released a sketch of a possible suspect in a rape at Green Farm Conservation Park in Gaithersburg.

The incident occurred on July 9 at about 5 p.m. A 21-year-old woman told officers that she was at a lake near the rear of the Hadley Farms community pool when she was raped by a suspect armed with a knife, police said.

The possible suspect is described as a Hispanic male in his late teens or early 20s, 5-foot-4 to 5-foot-7 and 120 to 140 pounds.

Anyone with information can anonymously call Crime Solvers of Montgomery County at 1-866-411-TIPS (8477) or 240-773-TIPS (8477) or text "MCPD" plus the message to 274637. Crime Solvers is offering a cash reward of up to $1,000 for information leading to an arrest in this case.