An unidentified criminal shot a man and injured another two at a busy Melbourne city intersection and run away on Monday.

Witnesses and police said the gunman appeared to be involved in a violent domestic row with a woman in a taxi and when two men intervened, he shot all three down.

The shooting followed an earlier incident outside a nightclub when the criminal grabbed a woman by the neck and hair and followed her after she got on a passing taxi.

Police appealed for the taxi driver to come forward.

Shortly after the incident, the authorities found a handgun believed to be that used in the crime at a nearby construction site.

The lives of the two injured people, at the age of 30 and 24, are still in danger after they underwent surgery at a local hospital.

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