In Louisville, Ky., a tense confrontation in the middle of a crowded street was partially defused when a black woman stepped forward and offered a policeman in riot gear a hug. They embraced for nearly a minute.

• In Birmingham, Ala., protesters started to tear down a Confederate monument that the city had previously covered with a tarp amid a lawsuit between the state attorney general and the city.
• In Boston, a police S.U.V. was set ablaze near the State House, sending up a column of black smoke after a large group of protesters had mostly dispersed.
• In Philadelphia, police officers in riot gear and an armored vehicle used pepper spray to try to repel rioters and looters. A wall of officers blocked an entrance ramp to Interstate 676 in the city, where the mass transit system suspending service starting at 6 p.m. as part of a citywide curfew.
• In New York, demonstrators marched across the Brooklyn and Williamsburg Bridges, snarling traffic. The Manhattan Bridge was briefly shut down to car traffic. Chaos erupted in Union Square at around 10 p.m., with flames leaping up two stories from trash cans and piles of street debris. The night before in Union Square, the mayor’s daughter, Chiara de Blasio, 25, was among the protesters arrested, according to a police official.
• In Chicago, the police superintendent, David Brown, excoriated the looters on Sunday as Gov. J.B. Pritzker activated the National Guard at the city’s request.
• In Louisville, Ky., a tense confrontation in the middle of a crowded street was partially defused when a black woman stepped forward and offered a policeman in riot gear a hug. They embraced for nearly a minute.