Police are investigating the circumstances surrounding an armed robbery in Tamworth early this morning.

About 12.30am (Sunday 26 October 2014), a man allegedly entered the rear door of a fast food restaurant on Roderick Street, Tamworth armed with a knife.

The restaurant was closed at the time with employees still present.

The man allegedly entered the kitchen area and threatened staff, demanding money.

An employee handed over cash before the man fled on foot.

Police from Oxley Local Area Command attended and established a crime scene that was examined by forensic specialists.

An investigation is underway and police are appealing for anyone with information to come forward.

The man has been described as being 180 to 185cm tall, with a medium build, and was wearing a balaclava, dark sunglasses and gloves. He was described as having a British accent with a deep voice.