India, Feb. 13 -- New Delhi

Four minor boys were apprehended and three men were arrested for allegedly stabbing to death a 17-year-old boy with at least four knives over personal enmity in Bawana JJ Colony in outer Delhi on Wednesday night, police said on Thursday.

The knives used in the murder were recovered, but the mastermind behind the plot is absconding, police said.

"The victim and his associates had allegedly assaulted the brother of one of the accused. He was killed in revenge for that incident. Investigation is underway to establish the full chain of conspiracy. The role of one Mohammad Farukh is being probed for the alleged conspiracy and abetment," said an investigator, who asked not to be named.

Police identified the arres...