Thunder Bay Police are investigating a robbery at the Shoppers Drug Mart at Grandview Mall that happened early yesterday evening. A man armed with a knife entered the store, demanded narcotics and fled with an undisclosed amount. No one was injured. The man is described as 5 foot 8 or 5 foot 9, thin build, and Caucasian, wearing a light coloured baseball hat and sunglasses, a tan coloured coat, black gloves and blue jeans. Anyone with information is asked to call the Thunder Bay Police or Crime Stoppers.