An eighth person has been charged with murder following the deaths of two boys walking home from basketball.
Chol Achiek, 12, and 15-year-old Dau Akueng were allegedly set upon by a group of males at Cobblebank in Melbourne's outer northwest earlier in September.
One boy was seen on CCTV being chased and attacked on the ground by three accused as he screamed for a woman to help.
Bystanders tried to assist the boys, but both died at the scene.
On Tuesday, a 15-year-old boy was charged with murder over Dau's death.
The boy was already in custody on unrelated matters and will appear in a children's court at a later date.
It comes after seven teenagers were hit with the same charge following raids across suburban Melbourne on Friday.
A Thornhill man, 19, a Sunbury boy, 16, a Hillside boy, 15, and a Sydenham boy, 16, were charged with Dau's murder.
A Caroline Springs man, 19, a Wollert man, 18, and a 16-year-old Sydenham boy were accused of being responsible for Chol's killing.
Prince Conteh, 19, Peter Addo, 18, and Abel Sorzor, 19 faced Melbourne Magistrates Court and were remanded in custody until their next appearance in December.
The four underage accused, who cannot be named for legal reasons, appeared at a children's court and were remanded in custody until their next appearance in February.
Police stepped up patrols in the Cobblebank area in an effort to reassure the community of their safety following the stabbing deaths.
Dau grew up in inner Melbourne, where he played and refereed for the Collingwood Basketball Association before joining the Wolfpack Basketball Club when his family moved to the city's outer west.
Chol's father, Chuti Ngong, told mourners at a vigil that his son, a member of the Nile Warriors Basketball Club, was a peaceful boy who was loved by everybody.
The Victorian government has reconvened a South Sudanese Australian youth justice expert working group in response to the deaths.
