An 18-year-old Dalit woman from the southern Indian state of Kerala has accused 64 men of sexually abusing her since she was 13 years old.
The police have so far arrested 28 people in the case, and the men are in custody and have not made any public statements.
The accused, who are aged between 17 and 47, include the woman's neighbours, sports coaches and friends of her father, police told the BBC.
The woman reported the alleged abuse after a team of counselors working under a government scheme visited her home.
The police have registered around 18 cases under various Indian crime laws as well as the Caste and Tribe (Prevention of Atrocities) Act – which is a law to prevent crimes against people belonging to lower castes and tribes in India.
Dalits are at the bottom of the Hindu caste hierarchy and face widespread discrimination in India despite laws protecting them.
Cases have also been registered under the Protection of Children from Sexual Offenses Act as the abuse took place when the woman was a minor, senior police officer Nandakumar S told BBC Hindi.
More cases are expected to be registered in the coming days as police are still investigating the case. A team of 25 people was created.
Police say the alleged abuse began when the girl was 13 years old. Her neighbor allegedly abused her and took sexual pictures of her, the News Minute website reported.
Her neighbor allegedly sexually abused her again when she was 16, recorded videos of the abuse and shared them with several others who continued to abuse the woman for many years.
A lawyer who heads the district's Child Welfare Committee (CWC) told the Indian Express newspaper that the woman was a sportsperson and attended various sports camps, which may have facilitated further abuse.
Police say the woman was gang-raped three times in the past five years.
Her alleged abusers reportedly used her father's phone number to contact her and the woman saved their contacts on the phone. The police are already using the phone to trace the accused.
The woman's family was reportedly unaware of the alleged abuse.
The matter came to light when a team of consultants visited the woman's home last month. The councilors brought the matter to the notice of the CWC and the woman was asked to appear before the commission along with her mother.
“She was counseled and she opened up to a psychologist about the sexual abuse she faced since the age of 13,” the CWC chief told the Indian Express.
He added that the woman has been shifted to a CWC-affiliated shelter for her protection.
The woman's claims sent shockwaves across the country. She is expected to give a detailed statement about the alleged abuse to a female police officer.
Additional reporting by Imran Qureshi, BBC Hindi