Mac's robbery spree continues

City police are still investigating two unsolved robberies at local Mac's Mart Stores since May 22nd. The latest was early Sunday morning at the North May Street location. Police spokesperson Chris Adams says it's part of a string of robberies at south side Mac's locations.  In the last two weeks there have been 5 separate robberies altogether and Adams say police are trying to look for any links between them.   Meantime,  police have a person in custody who was believed to have been carrying a knife outside the North May Street store early Monday morning.