DM Sanjay Kumar also issued a public notice on Friday in this regard. He also sought video footage of the incident from TV channels.
A turf war began on Thursday when Kumar had written to the area Deputy Commissioner of Police to provide all evidence regarding the incident as the AAP government had ordered him to carry out a magisterial inquiry into the case that was turned down by the city police which told him that he has no "jurisdiction" in the matter.
Deputy Commissioner of Police (New Delhi) Vijay Singh had refused to submit evidence to Kumar saying that the DM does not have jurisdiction to probe the case.
Kumar had shot back citing rules asking the police to provide the information till 11 AM today failing which he had threatened legal action. The police on the other hand refused to budge.
"We have initiated investigation in the case. We are taking prosecution's opinion over a possible legal action against the police as it has refused to cooperate with us in the investigation," Kumar said.
The legal notice, which appeared in newspapers on Friday and has also been put up at the DM's office at Jamnagar House, read "It has come to the knowledge that one person has allegedly committed suicide near a public meeting at Jantar Mantar, Delhi on April 22.
"Considering the fact that the person has committed suicide in full public view, in front of large gathering and in the presence of heavy deployment of police and such a sensitive place, District Magistrate, New Delhi will be conducting an enquiry under sub section 176(1) CrPC.
"Therefore, general public is requested to provide any piece of information/evidence in connection of the incident available with them in the office of the DM, Jamnagar House, Shahjahan Road before April 27 during office hours."

41-year-old Gajendra Singh, a father of three, had committed suicide by hanging himself from a tree in public view at an AAP rally on Wednesday in the presence of Delhi Chief Minister Arvind Kejriwal.

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