Police used tear gas, rubber bullets and pepper spray as the protests sparked by the killing of George Floyd continued nationwide into early Sunday.The big picture: Police responded over the weekend with force, in cities ranging from Salt Lake City to Atlanta to Des Moines, Houston to Detroit, Milwaukee to Washington, D.C., Denver and Louisville. Large crowds gathered in Minneapolis on Saturday for the fifth day in a row.Multiple cities imposed curfews for Saturday night as police continue to try to break up crowds.Civil rights icon Rep. John Lewis (D-Ga.) was among the leaders to urge protesters to demonstrate peacefully amid reports of looting and the burning of buildings in some places. "Be constructive, not destructive," Lewis said.A #Ferguson police captain joins protesters and a few other officers taking a knee in memory of #GeorgeFloyd. pic.twitter.com/UgzVnFcIWP— Robert Cohen (@kodacohen) May 31, 2020 City is shutting it down, enforcing curfew. People moved out of area. Streets are clearing out. I saw at least a half dozen people get arrested. Many looters have left the area, but there are stragglers. @KYWNewsradio #riots2020 #georgefloyd #phillyprotest pic.twitter.com/5pB3xOMtLF— Cherri Gregg (@cherrigregg) May 31, 2020 What's happening: Demonstrators are demanding justice for the killing of Floyd, a black man who died Monday after at least one police officer pinned him to the ground with a knee to his neck.The officer involved in Floyd's death was charged with third-degree murder on Friday, after protests had continued in Minneapolis for three days. Protesters and police face off outside the White House on May 30. Photo: Eric Baradat/AFP via Getty Images A journalist is injured after police started firing tear gas and rubber bullets near the 5th police precinct during a demonstration in Minneapolis on May 30. Photo: Chandan Khanna/AFP via Getty Images Police vehicles burn after being set on fire by demonstrators in the Fairfax District of Los Angeles on May 30. Photo: Mark Ralston/AFP via Getty Images People run from tear gas during protests in Seattle, Washington on May 30. Photo: Jason Redmond/AFP via Getty Images A woman is seen crying in New York City as protesters and law enforcement continue to clash following George Floyd's death on May 30, 2020. Photo: David Dee Delgado/Getty Images Demonstrators gathered at Lafayette Park in D.C. across from the White House attempt to breach a police barricade during a protest over the death of George Floyd on May 30, 2020. Photo: Yasin Ozturk/Anadolu Agency via Getty Images Protesters rally outside the statehouse in Columbus, Ohio for the fourth straight day. Photo: Megan Jelinger/Anadolu Agency via Getty Images The building burned down after protesters took to the streets for days following George Floyd's death. Photo: Tayfun Coskun/Anadolu Agency via Getty Images Police advance on demonstrators in Minneapolis as the protests continue for the fifth day in a row. Photo: Scott Olson/Getty Images Groups of protesters gather in Los Angeles as police cars burn in a fire on May 30, 2020. Photo: Kent Nishimura / Los Angeles Times via Getty Images A protester wearing a suit and holding a briefcase that says "Don't Shoot" in Brooklyn, N.Y. Photo: Ira L. Black/Corbis via Getty Images An injured woman is tended to near the White House after protesting the death of George Floyd on May 30, 2020. Photo: Alex Wong/Getty Images Demonstrators hold signs and chant with their fists raised in Miami, Fla. on May 30, 2020. Photo: Adam DelGiudice/AFP/Getty Images Protesters march down Main Street in front of the Wisconsin Capitol during a peaceful protest on May 30, 2020, in Madison, Wisconsin. Photo: Lawrence Iles/Icon Sportswire/Getty ImagesGo deeper: Protests over George Floyd's death grip Minneapolis