Police are investigating the overnight armed robberies of a food outlet at Wishart and an ice creamery at Camp Hill.

Around 9.00pm a woman entered the Newnham Road food outlet and threatened the female attendant with what appeared to be a blood-filled syringe. The woman fled on foot with a sum of cash.

Around 9.30pm a woman entered the Boundary Road ice creamery and threatened two female attendants with what appeared to be a blood-filled syringe. The woman fled of foot with a sum of cash across Boundary Road towards Whites Hill.

No one was injured during the robberies.

The woman in both incidents is described as Caucasian in appearance, aged in her late 20s, 165cms tall, with a slim build, fair complexion and blonde hair.

During the first incident the woman was wearing a blue or grey cap, a pink t-shirt with a black design on the front, short denim shorts with the cuffs rolled up and sandals.

In the second incident the woman was wearing a yellow cap, a grey hooded jumper and black long pants.