Seven teenagers are sitting in prison awaiting their next court appearance after being charged with murdering two boys walking home from basketball.

As 12-year-old Chol Achiek and his 15-year-old friend Dau Akueng were walking home at Cobblebank, they were allegedly ambushed by a group of masked males armed with machetes and other bladed weapons.

One boy was seen on CCTV being chased and attacked on the ground by three accused as he screamed for a woman to help in the September 6 incident in Melbourne's outer northwest.

After a series of early morning raids across seven suburbs in Melbourne's north and west on Friday, police arrested and charged seven teenagers with the slayings.

A Thornhill man, 19, a Sunbury boy, 16, a Hillside boy, 15, and a Sydenham boy, 16, were charged with Dau's

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