Police are investigating an armed robbery at a convenience store at Peak Crossing (south of Ipswich) this morning.

Around 5.35am a man walked into the store on Fassifern Street and produced a firearm. The man threatened the 30-year-old attendant and then stole cash from the till.

The man then fled the scene out the front door on foot.

He is described as being Caucasian, around 170cm tall with an average build and brown eyes. He was wearing green hoodie with light blue jeans.

Anyone with information which could assist police with their investigations should contact Crime Stoppers anonymously via 1800 333 000 or crimestoppers.com.au 24hrs a day.

Crime Stoppers is a charitable community volunteer organisation working in partnership with the Queensland Police Service.