Police are investigating the armed robbery of a post office at Slacks Creek this afternoon.

Around 1.30pm, two men entered the Kingston Road outlet and threatened an attendant with a screw driver.

They demanded money before one man jumped over the counter and removed cash from the till.

The other offender became involved in an altercation with a member of the public causing a t-shirt covering the offender’s face to fall off.

The pair fled the scene with a sum of cash and were last seen driving away in a dark blue or black Holden Commodore sedan.

No one was physically injured during the incident.

One man is described as being Pacific Islander in appearance, approximately 175cm tall with a muscular build and black short hair. He was wearing a black cap with a black jumper, cargo pants and white runners.

The other man is described as being Pacific Islander in appearance, approximately 180cm tall with a muscular build. He was wearing a black hooded jumper, grey tracksuit pants, white runners and red gloves.

Investigations are continuing.