Police are investigating the armed robbery of a second hand store at Moorooka yesterday afternoon.

Around 3.30pm three men entered the Beaudesert Road store. Two of the men were armed with a knife and a rifle and demanded money from staff.

After obtaining an amount of cash the three men left the store, jumped a rear fence and ran towards Goodwin Street.

Staff and customers in the store were not physically harmed during the incident.

The first man is described as 170cm tall with a heavy build.

The second man is described as 170cm tall.

The third man is described as 180-185cm tall with a heavy build.

The men were all wearing hooded jumpers.

Police are seeking information from anyone who may have seen a vehicle driving away from the scene.