Two men were arrested from Rohini on Thursday for allegedly killing a six-year-old boy and injuring a man in West Delhi's Inder Puri area last week, police said.
On Saturday, the boy, Prince Raj, who was looking through the window of his residence above a gym in Inder Puri was shot dead while another person, Mahender, sustained bullet injuries while entering the building.
One country-made pistol with four cartridges were seized from them, police added.
During interrogation, the accused disclosed that on March 2, Ramalingam had a fight with the gym owner Manish over a trivial matter. Ramalingam had then threatened to exact revenge on Manish, the police officer said.
On Saturday, Ramalingam, along with his cousin Vishal Naidu, Raju, and three others reached the gym to kill Manish. When they could not find him, they started indiscriminate firing in the gym, police said.
While leaving the gym, Raju noticed a boy looking at them from the window of a room above the gym. He told Ramalingam about it, who fired at the child, killing him. They also fired at Manish's brother and injured him, the ACP said.
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