Gun-toting men rob Sydney cash van

Two men have been robbed at gunpoint outside a Sydney shopping centre with a major police operation under way to track down four suspects.

Police say three of the offenders - two armed with guns - robbed the men as they were walking from a cash-in-transit van outside the Marrickville Metro after 2pm on Friday.

No one was injured and the bandits sped off in a black car driven by a fourth man.