Four minor boys drowned in the Yamuna river on Sunday in outer Delhi's Alipur, police said.
The children were aged between 12 and 14.
Seven boys, from Haryana, had come to Palla village to swim in the river.
Police said three of them informed that they could not find their other friends soon after jumping into the river.
By the time the rescue teams arrived, bodies of two boys had been found. The other two are still missing, they said.
The deceased were identified as Ankit and Lalit, both 13 years old.
The boys, whose bodies are yet to be recovered, were identified as Aditya (14) and Nitin (12). Ankit and Aditya are brothers.