Two children have been killed in a suspected targeted attack, with a father of one of the victims demanding answers.

The boys, a 12-year-old and 15-year-old, were fatally stabbed in the suburb of Cobblebank in Melbourne's outer northwest on Saturday evening, police said.

The 12-year-old was found with critical injuries on Marble Drive about 8pm before a 15-year-old boy was also discovered seriously injured on nearby Cobble Street.

Both were treated at the scene but could not be saved.

Officers believe the stabbings are connected and targeted, although the investigation remains ongoing.

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 i

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