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.
Sohail Nadvi, Amravati district head of PFI, was taken to Nagpuri Gate police station and was questioned, said an official.