The Mumbai Police have registered an FIR against unidentified persons on charges of cheating and forgery after recovering more than 4,500 affidavits being prepared in support of the Uddhav Thackeray-led Shiv Sena faction, an official said on Sunday.

Former Thane mayor Naresh Mhaske, who is the spokesperson of the other Sena faction led by Maharashtra Chief Minister Eknath Shinde, in a video message claimed the Mumbai Police have found 4,682 "fake" affidavits and registered a criminal case against unidentified persons based on a complaint.