Suspected gang members armed with machetes and knives are on the run after killing two young friends on suburban streets.

The boys, a 12-year-old and 15-year-old, were fatally attacked at Cobblebank in Melbourne's outer northwest on Saturday evening.

The 12-year-old was found on Marble Drive about 8pm, while a 15-year-old boy was discovered dead on nearby Cobble Street.

The pair, who were friends, were treated at the scene but could not be revived.

The 15-year-old victim has been named as Dau Akueng, whose father Elbino said his son and friends were attacked while walking home from a local basketball game.

The community had buried four children in the past month, Mr Akueng said.

"Similar incidents happening, there's no answer from police," he told reporters at the scene on Sunday mor

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