Man stabbed outside Vic shopping centre

A man has been stabbed outside a Melbourne shopping centre.

Police said the victim was fighting with another man when he was stabbed in the abdomen.

The man, aged in his 60s, was taken by ambulance to the Royal Melbourne Hospital in a serious condition.

The altercation took place outside a Northcote shopping centre about 11am (AEST) on Tuesday.

Police believe the men are known to each other.