Detectives are investigating the armed robbery of a fuel station in Cairns on Sunday night.
A woman entered the Reservoir Road business at Manoora just after 8pm and produced a large knife.
She made threats and demanded the attendant hand over money from the till.
The offender fled on foot with a sum of cash through a side gate backing onto Perkins Street.
The woman is described as Aboriginal or Torres Strait Islander in appearance, aged in her late teens to early 20s, around 170cm tall with a medium build.