Police are appealing for information after the armed robbery of a convenience store at Campbelltown yesterday.

About 5.10pm (Saturday 28 February 2015), a man entered a store on Chamberlain Street armed with a knife and threatened the female attendant, demanding cash.

Police have been told when the attendant struggled to open the cash register, the man lunged at her several times.

He was last seen running south along Lindesay Street, with cash.

Police from Campbelltown Local Area Command attended the location and established a crime scene.

Detectives would now like to speak with a man who may be able to assist with inquiries.

The man has been described as being aged in his 20s, about 182cm tall, with a medium build, dark complexion, facial stubble, and black fuzzy hair.

He was last seen wearing a black t-shirt and grey tracksuit pants with a black stripe down the sides.