A subway rider took photographs of a man who allegedly started masturbating while staring at her on the N train last weekend. Now investigators are hoping the public can help identify him.

According to the NYPD, the incident happened on a southbound N train in Brooklyn at 11:15 p.m. on Sunday, June 26th. Police say the man sat down across from the 24-year-old victim, "exposed his penis and masturbated while he stared at her."

The woman left the train at the Stillwell Avenue station and told police, who canvassed the station for the man but could not find him.

The victim share photos of the suspect with the police, who say he is 25-30 years old and was last seen wearing a red baseball cap, a white t-shirt, white shorts and black and white sneakers.

Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782). The public can also submit their tips by logging onto the Crime stoppers website at WWW.NYPDCRIMESTOPPERS.COM or by texting their tips to 274637 (CRIMES) then enter TIP577. All calls are strictly confidential.

The NYPD is working to crack down on subway perverts and strongly encourage victims and witnesses to report incidents. If you see or experience sexual misconduct in the subway (this includes seeing a masturbator, being groped, being grinded on, etc.), you can report it to the MTA and police on this website. There's also a place for you to upload photos and/or video. Don't let the perverts win.