"An FIR has been registered against over 50 BJP workers on a compliant of Samajwadi Party leader in Sambhal Mahmood Akhtar for gathering unlawfully to protest at Malviya Chowk yesterday," Additional Superintendent of Police (ASP) Kamlesh Dixit said.
During the protest, they had burnt an effigy of Chief Minister Akhilesh Yadav and raised anti-government slogans charging it with being responsible for the Mathura incident, Dixit said.
The FIR was registered yesterday under section IPC 143 (unlawful assembly), he said.
A probe is on in the matter, he said.