In a related development, the Bombay High Court granted interim protection from arrest to Ryan International Group's founding chairman Augustine Pinto and his wife and managing director Grace till tomorrow in connection with the murder.
The school, where the boy studied, is run by the group in Gurgaon.
Group CEO Ryan Pinto filed an anticipatory bail application in the high court this evening, their lawyer said.
Dr Deepak Mathur, who conducted the post mortem, also said there were two cuts on the boy's body and a nerve was slashed due to which he could not cry for help when he was attacked.
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A fact-finding three member committee, constituted by the Gurgaon district administration, submitted its report to District Commissioner Vinay Pratap Singh.
"The committee has detected lapses on the part of the school such as broken window, ill-equipped fire extinguishers, common toilets, no police verification of conductors and drivers and other ground staff, broken boundary wall and low quality CCTV without having wide-angle facilities, students' toilets without guard," Singh told PTI.
"The SIT recorded statements of two students who went to change their Taekwondo dress inside the toilet at the time of the crime. The team is also questioning the suspended school principal Neerja Batra and two other female teachers," a senior police officer said.
Schoolbus conductor Ashok Kumar, who allegedly tried to sexually assault the class II student in a toilet and slit his throat with a knife when he resisted last Friday last, was sent to judicial custody till September 17.
As police are working to crack the case, Subhash Garg, a businessman, claimed the conductor carried the injured boy to a car to be shifted to a hospital on the orders of two teachers.
"I saw two female teachers and two students were following an injured student who was being carried by Ashok Kumar. One of the teachers was weeping at that moment. She ordered Kumar to place him at the rear seat of the car," Garg told PTI.
"There were also blood stains spread all over the place in a small toilet at the ground floor of the school building. There were blood stains on Kumar's shirt which may be due to the fact that he was carrying the boy," he claimed.
The school bus' driver Saurabh Raghav claimed Kumar was made a scapegoat by the school teachers.
The matter of safety of children in schools was also taken up in the Supreme Court which agreed to hear a plea of two women lawyers seeking framing of "non-negotiable" child safety conditions and implementation of existing guidelines to protect school-going children from offences like sexual abuse and murder across the country.
The plea which also sought cancellation of licences and forfeiture of state grants of erring schools will be heard by the court along with the petition filed yesterday by the father of boy.
Officials of the ministries of women and child development and human resource development as well as representative of the National Commission of Protection of Child Rights (NCPCR), CBSE, NCERT, Kendriya Vidyalaya Sangathan will be a part of this meeting.