Meanwhile, police have said that no written permission was given to the rally till the end and they had appealed to the organisers to change the venue from Jantar Mantar to a spacious place --Ramlila ground.
A senior police official said that negotiations to change the venue were on till the end but organisers were adamant to march and 'gherao' Parliament.
The case has been registered under sections 186 (Obstructing public servant in discharge of public functions), 306 (Abetment of suicide), 304 A (Causing death by negligence) of Indian Penal Code.
Union Home Minister Rajnath Singh had earlier spoken to Delhi Police Commissioner B S Bassi and ordered an inquiry.
Delhi Police claims that on the basis of intelligence input they advised AAP organisers that the gathering could be around 20,000 and hence suggested a larger venue that is Ramlila Ground since Jantar Mantar proposed capacity is just 5,000.
"There (Jantar Mantar) would not be enough space available for safe movement, channelisation and quick dispersal of the crowds in case of a contingency.
41-year-old Gajendra Singh today hanged himself from a tree near the rally venue.
As police watched the whole drama, a couple of AAP workers climbed the tree and tried to rescue him, but by then the noose had stifled Singh, whose body hanged for a few moments before falling. He was rushed to the nearby RML hospital where he was declared brought dead.
