A case against 1,200 persons has been filed in this connection and the police have identified 26 of them, an official said.
Narsinghanand has several cases against him, including for allegedly making a hate speech at a conclave in Haridwar in December 2021, and was out on bail.
Singh said seven accused, including the mastermind of the June 21 murder, were arrested by the police while the search is on for one more person, identified as Shamim.
Irfan Khan is accused of plotting Kolhe's murder, allotting special tasks to the other accused and supplying vehicles and money to them.
Besides Bonde, Amravati district BJP president Nivedita Chaudhary, city Mayor Chetan Gawande, BJP state spokesperson Shivrai Kulkarni were also arrested.
The Amravati Police had clamped the curfew on Saturday for four days after stones were hurled at shops during the bandh called by Bharatiya Janata Party, a day after incidents of stone-pelting took place during a rally called by a Muslim organisation in protest against the purported communal violence in Tripura.
President Pratibha Patil's son and Congress Member of Legislative Assembly Raosaheb Shekhawat was on Tuesfay questioned by the Amravati police in connection with the seizure of Rs one crore unaccounted cash ahead of the civic polls. Accompanied by Maharashtra Pradesh Congress Committee general secretary Ganesh Patil and a battery of lawyers, Shekhawat reached the police commissioner's office in Amravati on Tuesday morning, where his statement was recorded in the case.