"I have filed a complaint at Vishrantwadi police station in Pune under section 507 IPC (criminal intimidation) against an unknown person and will take up the matter with the High Court when the public interest litigation comes up for hearing," Patil told PTI.
Senior Police Inspector P N Supekar confirmed that a non-cognisable complaint has been filed and investigations are underway.
The letter further said, "Hemant Patil, we will kill you, if you pursue the matter in the high court."
The PIL had urged the court to order an inquiry into speeches made by Owaisi and Pathan recently in which they had allegedly dishonoured the country by making some remarks.
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The petition had contended that the speeches made by them amounted to spreading communal disharmony and hurting national integrity and unity of the country.
The petition, which is slated to come up for hearing in due course, also demanded a ban on All India Majlis-e-Ittehadul Muslimeen (AIMIM), saying that remarks made by the duo amounted to violation of Representation of the People's Act and were against the basic principles of Constitution.
The PIL further sought a direction to the Maharashtra government, Director General of Police and Secretary of Home department to call for the records in respect of speeches delivered by Owaisi at a public rally in Latur and Pathan's utterances in the state Legislative Assembly that they would not say 'Bharat Mata Ki Jai'.