Detectives are investigating after an armed robbery at a convenience store in Chermside this afternoon.

At around 2:30pm three men entered the business on Gympie Road armed with knives and a brick.

One of the men threw a brick at a female staff member before the men threatened staff.

When staff fled to a secure room the men stole a handbag and a quantity of cigarettes.

The three men fled the scene and were last seen running towards Henry Street.

The female staff member was treated at the scene for a minor injury to the back of her head.

One of the men was last seen wearing a white t-shirt over his head, with a black t-shirt and black shorts.

The second man was last seen wearing a grey, long-sleeved t-shirt with black shorts, a black hat, and a white t-shirt over his head.

The third man was last seen wearing a black t-shirt with black shorts, a black hat and a black t-shirt over his head.

All of the men are described as approximately 175cm tall.

Anyone with information is urged to contact police.