A sixth night of mass demonstrations has put government officials, law enforcement officers and protesters at odds in cities across the United States after George Floyd, a black man, was killed in police custody in Minneapolis on Memorial Day.

Peaceful protests exploded into unrest and outrage in Washington on Sunday night, with some demonstrators setting and feeding fires. In Louisville, one man was shot and killed when police and the National Guard opened fire following a violent confrontation between a group gathered in a supermarket parking lot and law enforcement trying to disperse the crowd, authorities said early Monday.

Police arrested about 4,100 people in U.S. cities over the weekend, according to the Associated Press, and several people have died nationwide in the protests. Nearly a week after Floyd’s death, it remains unclear whether tensions across the country are calming or escalating.

Here are some significant developments:

  • The brother of George Floyd received the family’s first personal response from the Minneapolis police chief during a news conference Sunday. “To the Floyd family, I want you to know, that my decision to fire all four officers was not based on some sort of hierarchy,” said Minneapolis Police Chief Medaria Arradondo. “Mr. Floyd died in our hands, and so I see that as being complicit.”
  • President Trump was taken by Secret Service agents to an underground bunker at the White House on Friday night, according to two officials familiar with the incident, as protests over Floyd’s death erupted near the presidential residence.
  • Whether they were wearing press credentials around their necks mattered little, as journalists around the country continued to be targeted by police with arrest, rubber bullets and tear gas while covering the protests.
  • New York Mayor Bill de Blasio’s daughter, Chiara, was among the hundreds of protesters arrested in the city Saturday after failing to disperse when ordered by police, law enforcement sources told The Washington Post.
  • Protesters in Birmingham, Ala., tore down a monument to a Confederate naval captain on Sunday night, tying a rope around the statue’s neck and pulling it to the ground, video showed.
  • A truck driver who barreled toward protesters filling Minneapolis’s Interstate 35 Sunday has been arrested, according to police. The truck did not appear to hit any of the thousands who had gathered peacefully, they said.