Shubham (14) had lent his cellphone to one of the suspects a week ago and when he insisted on getting it back, he was asked to come to the school's backyard on Friday to collect it, Sonepat's Superintendent of Police Arun Nehra said.
"On reaching the spot, Shubham was strangled to death by the suspects. His body was dumped in the bushes near the school's boundary wall by the duo," Nehra said.
Shubham's father had filed a missing complaint after he did not return home on Friday.
The suspects, around 14 years of age, have been lodged in juvenile home in Ambala after being charged with murder. They have no criminal past, he said.