The boy was a class one student of Ryan International School in Delhi's Vasant Kunj.
A team of forensic medicine experts from AIIMS will visit Ryan International School in South Delhi tomorrow and examine the water tank where six-year-old Divyansh Kakrora, a Class I student of the school, was found dead.
The team, comprising Additional Professor Dr Adarsh Kumar, Assistant Professor Dr Kulbhushan Prasad and senior resident doctor at the Department of Forensic Medicine Dr Hans Raj Singh, will examine the spot where the incident took place before submitting the final report.
"The team of doctors was scheduled to go to the school today but the visit was called off as till afternoon we did not receive a written request from the SHO of the police station concerning the same.
"As per the procedure, a written request from the investigating agencies is a must to carry out any examination. The team will now visit Ryan International School tomorrow," said a senior doctor at AIIMS.
The AIIMS' preliminary post-mortem report indicated that Divyansh's death was due to drowning. There were no external injuries on his body that could lead to death.
The report pointed to asphyxiation (suffocation) due to aspiration of fluid into air passages as being the probable cause of the death, said sources at AIIMS.
Ramhit Meena, father of Divyansh, has blamed the school authorities for his son's death.
"It is a conspiracy by the school authorities and someone in the staff must be involved in the incident. I received a call from the school and I rushed to the emergency ward at the hospital, where I found the principal at the entrance.
"I kept asking everyone what had happened but nobody responded. Then the principal took me to the doctor who informed me that my son was brought dead to the hospital," he said.
However, the principal of the school had refuted the allegation and claimed that Divyansh was a special child who was "hyperactive" and had a tendency of running away from the classroom.
She, however, could not explain how the child fell into the water tank beneath the amphitheatre of the school. Divyansh was last seen before the seventh period on Saturday, which was around 12.20 PM.
The authorities then started looking for him and after sometime he was found floating inside the pit which is used as a water storage tank. It is under the amphitheatre in the school's playground.
An FIR was registered at Vasant Kunj North Police Station under Section 304 (A) of IPC against unknown persons for causing death due to negligence.