Police in Queens put out a warning Friday, urging residents to be on alert for a sexual predator targeting Asian women in their 20's and 30's.

So far he's attacked four times, dating back to September, investigators said.

Each time he roughs up his victim, throwing her to the ground or pinning her against a wall while he reaches under her clothes and gropes her.

No woman has been raped, but some have been treated for wounds to their face, head, hands and legs.

"I'm on guard," said Theresa Sangcap when PIX11 pointed out the corner outside an Astoria nightclub where the first attack took place. She said she was always nervous when she worked at night; now she tries to be home before dark. 

Melody Tian of Flushing said she always plays it cautious.  "I never go out alone after 9 p.m."  When not out with her boyfriend, she says she makes sure to have two girlfriends by her side.

The attacks took place at 37-04 Bowne Street, 44-35 Colden Street, and the intersections of 28th Street and 34th Avenue, and Sanfird Ave. and 147th Street.

The attacker is described as a Hispanic man in his 30's with black hair.  He is 5' 5" tall and weighs 140 pounds.

Detectives are hoping surveillance video that captured one of the attacks will help them identify the suspect.

Anyone with information on his identity is asked to call Crime Stoppers at 1-800-577-TIPS or at their website www.NYPDCrimestoppers.com. Or texting their tips to CRIMES to (274637), then enter TIP577.