Two children have died after being stabbed in Melbourne’s outer west.

Emergency services were called to Marble Drive in Cobblebank just before 8pm on Saturday after reports a person had been seriously injured.

They found a 12-year-old boy with critical injuries and tried to revive him but he died at the scene.

A short time later police found a 15-year-old boy seriously injured nearby on Cobble Street. He also died at the scene.

Homicide Squad detectives are treating the incident as a targeted attack and believe the deaths are connected.

The investigation continues.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000.