Police are investigating after a man entered a Wynnum West store yesterday afternoon and threaten a staff member with a knife.

Around 2.45pm a man entered the Sibley Street business and located a cash tin behind the counter. When the male staff member approached the man, he produced a small knife and threatened him.

The man then left the store with a sum on cash.

No one was physically injured during the incident.

The man is described as being 35-years-old, 185cm tall, olive complexion, dark coloured eyes, hairy arms, with tattoos on one arm, unshaven and wearing black baseball cap, dark green t-shirt, dark coloured shorts, white socks and a small black back pack.

Anyone with further information is urged to contact police.