Police are investigating the circumstances surrounding the robbery of a service station in Rooty Hill overnight.

Shortly after 6pm (Sunday 15 May 2016), a man entered the Rooty Hill Road South service station and purchased a packet of cigarettes.

As the male employee placed the money in the register, the man produced a firearm and allegedly threatened him while demanding money and cigarettes.

The man grabbed money from the register and cigarette packets before he fled from the store.

Fortunately, no one was injured during the incident

Officers from Mount Druitt Local Area Command are investigating the incident and would like to speak with the man who may be able to assist with inquiries.

The man is described as being of Pacific Islander/Maori appearance, aged in his 20s, with a tall, thin build and unshaven. He was last seen wearing blue work pants, a black and fluorescent orange work shirt and grey bucket hat.