Two men, aged 22, were arrested on suspicion of murder on Wednesday, 1 September. They remain in custody at central London police stations.
An 18-year-old man who was arrested on suspicion of murder has been released with no further action.
A second man, aged 19, was arrested on suspicion of murder. He was taken to a south London police station and was subsequently released on bail to return on a date in mid-September.