MONTGOMERY COUNTY, Md. (WUSA) -- Police released the sketch of a man wanted for sexually assaulting a woman at knife-point on July 9 in Gaithersburg, Montgomery County Police said. 

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The assault took place at the Green Farm Conservation Park at 8711 Snouffer School Road, at around 5:05 p.m., police said.

"A 21-year-old female reported that she was at a lake (to the rear of the Hadley Farms community pool) in the Green Farm Conservation Park when she was attacked by an unknown male. The suspect was armed with a knife and sexually assaulted her. The suspect was last seen leaving the park on foot in the direction of Brenish Drive," police said in a news release. 

The suspect is described as a Hispanic male, 5'05" to 5'07" tall, weighing 130 to 150 pounds, wearing a black knit cap and blue jeans, police said. 

Police are still investigation. If you have any information about this incident, call 240-773-5070.