Caboolture detectives are investigating the armed robbery of a convenience store at Ningi earlier tonight.

Around 6.20pm a woman entered the Bribie Island Road store before threatening a female employee with a knife.

The woman obtained a sum of cash before fleeing the scene on foot.

She is described as Caucasian, 178cm tall, with a thin build and sandy blonde wavy hair.

She was wearing a dark grey beanie, hooded baggy grey jumper, and long dark pants.

No one was physically injured during the incident.

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