All three women had placed ads online looking to exchange sex for money, and had arranged to meet with an interested party this summer. Each reported afterward that she had been raped and robbed by three men.

One suspect, Fernando Sandel, 26, was arrested on Friday, officials said. He was arraigned Sunday night on five counts of rape and multiple counts of burglary, robbery and other crimes. His bail was set at $200,000, and he will next appear in court on Aug. 24.

Two other men — Isaiah Rivera, 31, and Joey Cruz, 26 — were detained Sunday night, the police said.

The women all had advertisements on Backpage.com, a website for classified ads with extensive listings for adult entertainment. The terms of the site explicitly prohibit soliciting sexual acts in exchange for money, but the site still contains listings to that effect.

Image Joey Cruz Credit... New York Police Department

In all three of the assaults, the women were made physically vulnerable — sprayed in the face with Mace or another debilitating substance, or placed in a precarious position — before being raped and subsequently robbed of cash or other valuables.