Police have released CCTV images of a woman who may be able to assist with investigations into an armed robbery at Kallangur which occurred on July 2.

Around 12.30pm two men armed with a firearm and a knife entered the Anzac Avenue second-hand store before threatening staff and customers and demanding money.

The pair left the scene with a sum of cash.

No one was injured during the incident.

Police believe the woman may also be able to assist with investigations into similar offences at Moorooka and Stafford second-hand stores in the past two months.

Officers are encouraging anyone with information to contact Petrie CIB on 3897 7240 or Crime Stoppers on 1800 333 000.

CCTV footage can be accessed via the below link:

http://www.youtube.com/watch?v=v2Ra9FIzeqM