The police said the cause of Sarna's death is "brain haemorrhage" and "shock" due to head injuries by blunt objects but virtually gave a clean chit on allegations of assault to his four friends at the party, against whom fingers were raised by Sarna's parents.
Surender Bali (40) and Naresh Mishra (60), guards posted at the South Park Apartments, have been arrested under section 302 (murder) of Indian Penal Code for causing grievous head injuries to Sarna with batons they were carrying with themselves after Sarna created ruckus at duplex house of his friend Pranil Shah in Kalkaji.
Sarna's four friends, Shivang, Madhav Bhandaru, Rhythm Girhotra and Pranil Shah, all in their 20s, have been arrested under section 27 of the Narcotics Drugs and Psychotropic Substances Act for consumption of the contraband, said Deputy Commissioner of Police Dr P Karunakaran.
Even though the police have booked two guards for murder, the investigator said a panel of doctors from AIIMS will give a final report on Sarna's injuries and depending on it, police may modify the charges in the chargesheet.
"We may drop the murder charge against the two guards. We are investigating the case. Let's wait for the report by the panel of doctors," Karunakaran said.
On allegations of Sarna's parents that the four of his friend's were responsible for their son's death, the official said investigators did not come across any evidence that they had hit him.
Police said about one hour after consuming the drug, allegedly Lysergic acid diethylamide (LSD), Sarna suffered a "bad trip" and started behaving abnormally. He became violent and started creating ruckus.
Sarna not only broke a LCD TV in Shah's house, where all the five had consumed drugs, but also had a scuffle with friends. Soon all of them came out of the room and subsequently, all, except Shah, were turned out of the house by Shah's parents.
Sarna sat outside the duplex house on the second floor and kept on shouting. A neighbour called the two guards, Bali and Mishra, to contain the ruckus.
When the guards approached them, Sarna started to run but was eventually taken down by the guards who beat him with their baton leading to injuries on his head, back and other parts of the body, police said, adding he slapped his friends and guards who first tried to calm him down.
He said Sarna kept behaving abnormally and began running on the road below the flat. While running he banged himself against several cars and hit a closed iron gate.

Two remanded to police custody

Meanwhile, two out of the six accused were remanded to two days of police custody by a Delhi court.
Metropolitan Magistrate Deepak Wason sent Shivank Gambhir and Madhav Bhandari to police custody till September 19.
The court, however, remanded the remaining four arrested accused -- Praneel, Ritham Girhotra, Surender Bali and Naresh Mishra -- to judicial custody till September 30 after the police said they were not required for interrogation.
While seeking two days' custody for Shivank and Madhav, the police said the investigation is at an initial stage and the chain of the events has to be unearthed as to why the two went to Praneel's flat and consumed drugs.
"We have seized an electronic data from the spot, which has to be probed thoroughly as it may give us the clue about the flow of drugs in India through illegal channel, in which accused were involved," the police said.

The court sought clarification from the police regarding invocation of murder charges against the deceased's four friends and asked the police to submit a report about the consumption level of drugs.
The counsel for Shivank and Madhav opposed the police plea saying his client has been booked purely under NDPS Act which carried a maximum one-year jail term, so they should be released on bail.
"My (Shivank and Madhav) charge is of consumption of drugs. For the last three days, I am in police custody, nothing has been recovered from me so far," the duo's counsel said.
The court will hear the bail application of Shivank and Madhav on September 19 when their police custody ends. However, it will hear the arguments on Praneel and Ritham's bail application on Wednesday.


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