MINNEAPOLIS—Multiple cities imposed nighttime curfews and deployed additional law-enforcement resources on Saturday, as officials braced for what they expect to be another night of violent protests following the nationwide demonstrations Friday night that led to thousands of arrests and at least two deaths.
In Minnesota, where protests began this week after the death of George Floyd on Monday, Gov. Tim Walz pleaded with residents to obey an 8 p.m. curfew. Mr. Walz said he was fully mobilizing the state’s National Guard after…