City police are looking for a man who reportedly robbed a Mac's convenience store using a knife early this morning. Just prior to 4:00 a.m. Thunder Bay Police Service responded to Mac's Mart on the 7-hundred block of Simpson Street regarding a robbery. Police say a man entered the store with his face covered, armed with a knife and then subsequently fled the scene with an undisclosed amount of money. The man was last seen heading into the East End on foot. No injuries are reported in this incident.