A fourth boy has been arrested in the Matthew Kitandwe murder investigation.
Matthew was stabbed outside his home in Battersea on June 21.
A 15-year-old boy was arrested on suspicion of murder on July 28 in Croydon.
He is in custody in a south London police station.
June 22: Updated: Murder probe after South Thames College pupil stabbed to death in Battersea
July 6: Tracing cars could be key to solving murder of teenager Matthew Kitandwe in Battersea
Three others remain on bail.
An 18-year-old man was arrested on suspicion of murder June 23 and bailed until a date in August.
A 16-year-old boy was arrested on suspicion of muder on June 27 and bailed until a date in September.
A 17-year-old boy was arrested on suspicion of murder on July 8 and bailed until a date in September.
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