Police are appealing for witnesses after an armed robbery at a shop north of Sydney last night.

About 8.50pm (Thursday 15 August 2013), a man has entered a shop on The Boulevard, Toronto, armed with a knife.

He approached the 64-year-old female employee, demanding money.

The employee complied handing over an amount of cash.

The man pushed the woman to the ground, he then ran from the shop with the cash.

Police from Lake Macquarie Local Area Command attended and established a crime scene.

The woman received a small laceration to the back of her hand and was treated by Ambulance Paramedics at the scene.

The man is described as being approximately 165cm tall, in his late teens and of a slim build.