A 36-year-old man has become the sixth suspect to be arrested on suspicion of murder after the body of a teenager was found in a garden, police said.
Officers searching a semi-detached house in Lynsted Gardens, Eltham, south-east London, on Sunday found the remains of 18-year-old Stephen Ojerinola, of London.
A post-mortem examination at Greenwich Mortuary on Tuesday revealed he died from stab wounds.
Three women, one in her 60s and two in their 40s, and a man also in his 40s, have been bailed to return next month, pending further inquiries.
They were arrested on suspicion of murder and conspiracy to pervert the course of justice.
A 35-year-old man was also arrested on suspicion of murder.
The two remaining suspects are in custody at a south London police station.