A top official with Mac's Convenience Stores says Thunder Bay residents should not be concerned if alcohol is sold at its stores here. While the stores have been robbery prone, company vice president Tom Moher says alcohol sales would not increase the frequency of hold ups. He says they have operated two LCBO outlet stores in the province and there has been no increase in robberies at either location. The company is asking the province to allow alcohol sales at all its Mac's stores in the province.