An investigation is underway after a number of shots were fired during an armed robbery at a post office in Blackrock in Co. Dublin this afternoon.

The incident happened at half past two at Woodbine Park when a masked man entered the premises.

No customers were in the post-office at the time and the men fled on foot empty handed.

Gardaí say he was challenged by a male passer-by who received minor injuries and the suspect got away.

A handgun was recovered during the struggle.

Anyone with information is asked to contact Donnybrook Garda Station on 01-6669200.