Alleged attack took place in hotel room over several days after woman claims her water was spiked by a local tour guide
Indian police arrested four men on Monday on suspicion of drugging and raping an American tourist who visited Delhi earlier this year.
The 25-year-old woman alleges that during the April trip she given spiked water in her hotel room and sexually assaulted by five men over two days.
She returned to the US but had no memory of what happened to me while I was in India, the woman told NDTV. I regained my memory three months later around the end of July and thats when I took action.
Police launched a formal investigation earlier this month after the woman filed a complaint through an American charity.
A Delhi police spokesman, Dependra Pathak, said the suspects included a tour guide, a cleaner, a driver and an another employee of the Apeejay Surrendra Park Hotel.
The victim had recorded her testimony and will return to the US on Tuesday evening, Pathak said. The woman said the arrests were a positive step.
The suspects, all aged between 20 and 24, have told investigators they are being falsely accused, the Press Trust of India reported.
The alleged assault as one of the latest in a series of sex attacks on foreigners in India, reigniting concerns about womens safety in the country.
A 35-year-old Japanese tourist was raped in southern India last month.
In June, five men were jailed for life for gang-raping a 52-year-old Danish tourist in New Delhi in 2014.
India introduced tough laws against sex offenders in the wake of the fatal gang-rape of a student in the capital in December 2012 that sparked mass street protests.
But high levels of sexual violence against women continue.