Navlakha, in the apex court, has sought bail on the ground that the NIA failed to file its charge-sheet within the prescribed upper-limit of 90 days as per Section 167(2) of the CrPC.
Senior advocate Anand Grover claimed that the investigation is 'unfair, biased and deficient' as indicated by 'illegalities' in search of the houses of the activists.
Bhima Koregaon violence: Supreme Court extends house arrest of five rights activists till September 20
The court also said that the material, supporting the arrest of the five activists in the case, needed to be examined.
The bench said if there were some grave lapses, then it may consider the prayers like investigation by an SIT in the case.
Teltumbde was one of the several Dalit thinkers whose homes were raided on August 28 by Pune police in connection with Bhima-Koregaon violence of January 1.
There is a reference to the meetings in Paris and some other countries in the letters recovered from activists arrested in June and this week, police said.
'They (Navlakha’s family) are kind to me. Their children are also respectful. I am shocked to know they are linked with wrong people; it’s hard to believe,' Prasad, a tea seller in that area.
A bench headed by Chief Justice Dipak Misra questioned the Maharashtra police for arresting these persons after around nine months of the Bhima-Koregaon incident.
He said those raising voices against the government were NGOs and non-political organisations, but had their roots in the masses.
Arrest of activists ploy to divert attention from failures of BJP governments: Mayawati slams 'government terror'
The BSP chief said the government was trying to intimidate poets, lawyers, activists, human rights advocates, professors and intellectuals.
Tuesday's arrest of five rights activists from different parts of India, triggered a massive outcry.
Bhima Koregaon violence: Historian Romila Thapar, four others move SC against rights activists' arrest, hearing at 3.45 PM
The petitioners have further urged the SC to direct an independent probe into the arrest and have also requested that the Maharashtra government gives an explanation for 'sweeping round of arrest'.
Pune Police told a court on Thursday that they seized a letter from the residence of one of the five persons they had arrested in connection with the Bhima-Koregaon violence.
Participants expressed concern about recent 'tendency of the government of branding people as anti-nationalists if they support the cause of Dalits' and also demanded the release of those arrested.
Ekbote, who heads a right-wing organisation called the Samast Hindu Aghadi, was booked by the Pune Police in two separate FIRs on charges of inciting violence.