Police are investigating an armed robbery in the state’s north where a blood filled syringe was used to threaten staff.

About 10.20am (Sunday 9 October 2016), an 18-year-old woman was working at a store on Maitland Street, Narrabri, when a man holding a blood filled syringe entered the store.

The male threatened the woman with the weapon and was handed an amount of cash. He then fled the scene.

Police believe that a man shown in a CCTV image can assist with their investigation.

The man is described as Caucasian appearance, aged in his 20s and 170-175cm tall.

He is shown wearing black pants and a black jumper with a “Lonsdale” logo, a black cap, white socks and no shoes.