They are awaiting forensic report in connection with the incident along with the medical board's opinion on the boy's postmortem examination. The initial report has, however, suggested the boy died of drowning, a senior police official said, adding foul play can still not be ruled out.
In the last three days, police have questioned several teaching and non-teaching staff, including the principal of the school. Their versions were corroborated with what the boy's parents had to say, following which the police have found significant differences.
Meanwhile, some of the staff members have also come under the scanner and are suspected of tampering with evidence. If it turns out to be so, Section 201 of IPC will be added in the existing FIR, the official said.
Divyansh Kakrora, a Class I student of the school in south Delhi's Vasant Kunj area, was found dead on January 30, following which Delhi government had also ordered a magisterial probe.
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In a similar incident which took place around three days before Divyansh's death, a five-year-old boy had died after he fell into an open septic tank in a corporation-run school in southwest Delhi's Kapashera area.
By connecting the dots in Divyansh's case, what police have so far been able to infer is that Divyansh had gone missing before the seventh period and later his body was found floating in a water reservoir under the school's amphitheatre.
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The other differences in versions revolve around who was entrusted with the maintenance of the reservoir, whether the fact that the door of the amphitheatre was open was known to the school authorities and who exactly sp(REOPENS DEL42)
The school authorities had taken the boy to hospital instead of informing police first. The boy was declared brought dead there and the hospital authorities called up the police around 2.40 PM, the official said.
Sources said police's suspicion aroused when it found the door to the reservoir locked after the incident. This, they said, could indicate tampering with evidence.
The boy's father termed it a conspiracy and alleged someone from the school was behind the incident. The family has demanded a CBI probe into the matter.