Three individuals, including a teenager, were fatally stabbed in separate incidents across North and Northwest Delhi on New Year's Day. The first incident involved a 50-year-old tailor who was attacked after asking a group of juveniles to lower their music volume. A second incident saw a 15-year-old boy stabbed to death in Sultan Puri. Police are investigating both cases, detaining one juvenile in the first incident and reviewing CCTV footage and eyewitness accounts.