Detectives are keen to trace three men seen loitering in the area before a man was stabbed at a property in Roehampton.
The victim, believed to be in his late 30s, was found with serious injuries, following a break-in at the house, on Tuesday evening.
A 15-year-old boy has been remanded in custody after appearing in court today, charged with murder, and a 17-year-old male is being questioned by police.
Anyone with information should call police on 0208 721 4205 or Crimestoppers on 0800 555 111.
More top news
Brat Pitt joined a World War Two veteran on the red carpet for the European premiere of his latest film about a tank crew.
A group of women visit the Emirates stadium as part of an initiative to get Asian women involved in football.
The weather's expected to stay dry today but rain and wind are on their way.