A 17-year-old boy, Vivek alias Sona, was stabbed several times and then bludgeoned to death with stones allegedly by his friends in a park in south Delhi’s Khirki Extension on Friday. Police said they had apprehended three juveniles, who revealed they committed the crime as Vivek had thrashed them a few months ago. Raids are being carried out to apprehend three other juveniles. Police said they received a call on Friday morning regarding a body found in Satpula Park. It had stab wounds to the stomach, chest, neck and face.