Officers investigating the murder of Solomon Small in Lambeth have made a second arrest.
A 17-year-old boy [was arrested on suspicion of murder on Tuesday, 20 August. He remains in custody at a South London police station.
Homicide detectives from Specialist Crime continue to investigate the death of 18-year-old Solomon on Thursday, 15 August.
Police were called to Corrance Road, Brixton, shortly before 2pm, where Solomon was found with stab injuries.
Despite the efforts of paramedics, he was pronounced dead at 14:41hrs.
A post mortem examination on Friday, 16 August gave the cause of death as an incised wound to the chest consistent with a knife.
A 17-year-old boy already arrested on suspicion of murder on Thursday, 15 August has been bailed to return on a date in mid-September.