A Class 9 student who was found unconscious in the toilet of his school in northeast Delhi’s Karawal Nagar died later in hospital on Thursday. The Delhi Police on Friday detained three people based on CCTV footage that showed five people, including the deceased, fighting inside the toilet, ANI reported.

The police said a case of murder was filed after CCTV footage confirmed the boy fought with four other students. “He fell down after he received punches during the fight,” Deputy Commissioner of Police (northeast) AK Singla said.

The school authorities, however, have claimed the boy was suffering from diarrhoea, which led to his death, and the police said they did not find any injuries on the boy’s body. However, his parents have alleged that he was beaten up by other students, the Hindustan Times reported.

The police said the medical board will conduct a post mortem on Friday, PTI reported.

On Thursday, a teacher from the school had said “there was no scuffle”, according to the Hindustan Times. “The boy was not keeping well. He fell unconscious and was taken to the hospital as soon as the school came to know of it,” a teacher from the school told the newspaper.

The boy’s cousin, however, claimed the school was hiding facts and said the police’s claims of no injuries on boy’s body were not true. “He did not die because of an ailment but was beaten up and that too under the watch of the teachers,” the Hindustan Times quoted the cousin as saying. He also claimed to have seen injury marks on the boy’s neck and chest.

In September 2017, a Class 2 student was found with his throat slit inside the toilet at a Gurugram school. His senior from the school has been detained in the case.