SUPERIOR, WI (KDAL) - Superior Police are investigating a robbery Tuesday afternoon at the ICO Gas Station and Convenience Store at 2704 North 21st Street in the Billings Park neighborhood. While waiting for change from a small purchase, the suspect pulled a knife on the clerk and demanded all the money in the register. While he said that, the suspect reached over the counter and into the cash drawer, grabbing a small amount of money. The suspect then fled the store and ran around the building and out of sight. The suspect was described as in his late teens or early 20's, about 5 foot 7 inches tall, wearing a knit hat, dark colored jacket and tattered blue jeans. Anyone in the area around 3 p-m Tuesday or with any other information is asked to contact the Superior Police.