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
Hundreds of opponents to a third Heathrow runway have gathered outside the Palace of Westminster.
Elizabeth Hurley told ITV News it was vital for those who survive the disease to continue to be supported after their recovery.
The mother of Shane Virami are taking Thomas Cook and a friend of his to court over his death.