Police investigations are continuing following a string of robberies and attempted robberies targeting pizza shops in Sutherland.

About 10.30pm (Sunday 22 January 2017), a man entered a pizza shop on Kiora Road, Miranda.

The man threatened an employee with a knife, took cash from the register and left the store via Karimbla Road.

About 10.20pm (Tuesday 31 January 2017) a man entered a pizza shop on Port Hacking Road, Caringbah and demanded cash. An employee ran to the rear of the store, and the man left the store empty-handed.

About 9.50pm (Wednesday 1 February 2017) a man entered a pizza shop on Old Princes Highway, Engadine armed with a knife and demanded cash. A store employee gave the man an amount of cash before the man left the store on foot.

About 10.15pm (Saturday 25 February 2017), a man entered a pizza store on Kiora Road, Miranda armed with a knife and demanded cash.

An employee ran toward the back of the store and screamed for help. A number of other employees approached the man who turned and left the store.

Police believe the four incidents are related and would like to speak to a man shown in CCTV images who may be able to assist with inquiries.

He is described as being 180cm tall, with a medium build and is shown in the images wearing a blue hooded jacket, dark grey shorts and green shoes.