Seven teenagers have been charged in connection to the alleged murders of two teenage boys walking home from a basketball game.

Dau Akueng, 15, and Chol Achiek, 12, died after they were allegedly stabbed in separate incidents shortly before 8pm on September 6 in Cobblebank , in Melbourne's outer west suburbs.

Both boys were treated by emergency services, but died before they could be transferred to the hospital.

"The word senseless has been used so many times already in relation to the deaths of Dau Akueng and Chol Achiek, because the reality is that it doesn't make sense," Assistant Commissioner Martin O'Brien said.

"Two children walking home after playing sport, who should have had decades of their lives ahead of them," he said.

"Instead, their devastated families are grieving t

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