Police are investigating the robbery of a post office at Salisbury this morning.

Around 11.50am three men entered the Ainsworth Street post office.  One of the men walked to the side of the front counter and kicked a door off its hinges.

He threatened the male attendant and demanded cash.  He was holding an unknown implement.

The man removed cash from the till before all three men fled on foot along Georgina Street towards Orange Grove Road.

The attendant was not physically injured during the incident.

The first man is described as being of Pacific Islander in appearance, 180cms tall, medium build with an olive complexion.  He was wearing a white T-shirt and trousers.

The three men were all wearing something dark over their heads concealing their faces.