In a charge sheet filed before a city court, the agency has alleged that the accused -- Aniruddha Singh, a Rajasthan- based tourist guide, Vivek Srivastatva, who was working in the hotel when the crime was allegedly committed, Omprakash and Maqsood -- also had unnatural sex with the victim and that they also made videos of the act.
According to the sources, all the four persons have been chargesheeted under sections 376 D (gangrape), 377 (unnatural sex), 328 (causing hurt by means of poison) and 323 (voluntarily causing hurt) besides 506 (criminal intimidation) read with section 34 (common intention) of the IPC.
The 25-year-old US national had arrived here last December to join the probe and recorded her statement before a judicial magistrate where she reiterated that she was gangraped by five persons in the hotel.
Four accused were arrested after the Delhi Commission for Women (DCW) issued a notice to the police asking them why the Rape Crisis Cell of the panel was not informed when the victim's statement was recorded.
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Earlier, the complainant had said she was "not satisfied" with the probe and was ready to come to India to identify the accused.
She had also stated that the accused had made a video of the act and threatened to make it public if she reported the matter. She had also told the police that the accused had claimed to have sexually assaulted a couple of other female tourists as well.
A team of psychologists and psychiatrists had assisted the woman in recalling the details of the incident.