The NYPD has released a sketch of suspect who threatened a woman with hammer, then forcing her into a back alley where he raped her.

The victim was concerned about a friend's safety in the evening of Monday, April 8th – and walked her friend to the subway station at Gates Avenue.

After making sure her friend made it into the station without incident, the 18 year-old turned around and started walking home, sources tell PIX11 News. That's when she was confronted by a man who threatened to hit her with a hammer he was wielding, he forced her into a back alley where he raped the victim before fleeing.

The attack took place just past midnight in the Bedford-Stuyvesant section of Brooklyn. The victim checked into Woodhull Hospital where a rape kit was administered and police were called.

But there's more. Cops believe the same hammer-wielding guy tried to rape another woman, a 22-year-old, just after 11 a.m. They released surveillance tape of the suspect following the woman up the stairs inside her apartment building near Stone Avenue. He attacked with the hammer but she was able to fend him off according to police.

The suspect is described as a light-complexion black male, 20-22 years old, 5'8" and about 150 lbs. During the attack on Monday night he was wearing black framed glasses and carrying a black North Face backpack. Clothed with a black Rich Yung cap, a hoodie, dark jeans and a dark jean jacket, red white and black sneakers.

Anyone with information that may help in this case is asked to call the confidential Crime Stoppers line at 800.577.TIPS or contact on-line at nypdcrimestopper.com.

MIKE GILLIAM CONTRIBUTED TO THIS STORY