The three juveniles, all aged over 16 years, were apprehended in the last 48 hours in connection with the murder, they said.
According to police, they had found a body with as many as 47 stab injuries in a public park at Nand Nagri on Thursday. The deceased was a youth from the same locality whose body was identified by his mother and brother.
Two of the juveniles in the case were allegedly hired by the third to kill his brother and had offered Rs 20,000 for the contract, DCP (Northeast) Ajit Kumar Singla said.
Police zeroed in on him and took him in for questioning, during which he confessed to having murdered the youth along with another juvenile. He also said he had flushed his SIM card in a toilet to avoid getting tracked by police.
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After the second of the juveniles was apprehended, the duo disclosed that they were paid Rs 20,000 by the brother of the deceased, also a juvenile.
Thereafter, police apprehended the third teenager, who told them that he got his brother killed as he used to hit their mother and often got into fights with other family members.
One of the juveniles threw the deceased person's mobile phone in a garbage dump, which the other juvenile, however, retrieved secretly. The phone was later recovered by the police. One of the juveniles also sustained an injury on his thigh with the same knife that was allegedly used in the murder.
"We are also in the process of writing to the Juvenile Justice Board urging them to act in view of the amended Juvenile Justice (Care and Protection of Children) Act, 2015, under which juveniles over 16 years can be treated like adults in cases of heinous offences," he said.