There are no arrests at this time. Police say the incident took place at 1:45 a.m. in the Richmond Hill section.
While most people were sleeping, the suspect was preying on an 18-year-old woman.
Police say an 18-year-old woman was walking down the street, when a man armed with a gun took her to the back of a building where she was robbed and sexually assaulted.
A resident, who didn't want to be identified, said he tried catch the man, but the attacker escaped.
Police are now looking for that suspect too. He is yet another suspect who is preying on people in this area. Now three different suspects are wanted in separate attacks.
This case doesn't fit the pattern in the two previous cases where suspects targeted their victims with knives or threats.
But the latest case near 123rd Street and 103rd Avenue does match a recent robbery at gunpoint. Another case that remains unsolved.