Minneapolis Mayor Jacob Frey has declared a state of emergency in the tension-filled city where an African-American man died while in police custody Monday night. Minnesota Gov. Tim Walz has called out the National Guard to try to prevent a third straight night of violence. Several stores in Minneapolis and the twin city of St. Paul were set on fire Thursday night. St. Paul police report officers being hit by rocks and bottles. There are also reports of looting in St. Paul.