It has also asked the Central Reserve Police Force (CRPF) to file an affidavit stating that it has provided security to the victim's family members.
Those arrested included a Kerala journalist, Siddique Kappan, who has not filed any bail application so far.
The victim in the Hathras case and her family were treated badly by the Uttar Pradesh government, Priyanka Gandhi alleged.
A 19-year-old Dalit woman was allegedly raped by four men in Hathras on September 14. She died on September 29 at Delhi's Safdarjung Hospital during treatment.
A 19-year-old Dalit woman was allegedly raped by four upper-caste men in Hathras on September 14.
CBI also summoned inspector DK Verma, the suspended in-charge of Chandpa police station under which Boolgarhi village falls, for further questioning.
While another team interrogated the Hathras doctor, a thid team grilled a youth who claimed to be an eyewitness to the alleged presence of the victim with her mother and brother during the incident.
The victim’s brothers have even urged the authorities concerned to shift the gang rape-murder case to Delhi.
While the victim succumbed to a vicious sexual and physical assault, the family has since been subjected to an enormous amount of emotional attack.
No SC/ST member part of CBI team probing Hathras rape case, transparency needed: Chandrashekhar Azad
Earlier in the day, Central Bureau of Investigation (CBI), re-summoned the father and the two brothers of the victim for questioning. They were questioned by the CBI team on Tuesday as well.
In its order after Monday's hearing, the Lucknow bench of the high court warned against 'character assassination' of the victim and urged restraint by officials, political parties and the media.
Though Uttar Pradesh reported highest number of crimes against Dalits in 2019, Rajasthan had maximum atrocities at 55.6%
Days after the alleged gang-rape and murder of a Dalit girl in Hathras, the spotlight is back on the way the victims and their families are treated.
The fact-finding team had decided to submit its report to the president, the chief justice of India and the PM after the visit.
The case was earlier registered at Chandpa Police Station, in Hathras district of Uttar Pradesh, on a complaint by the victim's brother.