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 8: Matthew Kitandwe murder: Third teenager arrested after 'promising footballer' 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.