People pose for photographs with members of the New Black Panther party after they announced their intent to protest the death of Alton Sterling at the Baton Rouge Police Department headquarters in Baton Rouge on Saturday.

Lee Barnes, right, comforts Taylor Thompson as she cries during a Black Lives Matter demonstration in New York on Sunday.

Police arrest activist DeRay McKesson during a protest along Airline Highway, a major road that passes in front of the Baton Rouge Police Department headquarters, on Saturday.

Black Lives Matter activist DeRay McKesson walks out of the Baton Rouge jail Sunday in Louisiana.

Protesters rally before a march during a Black Lives Matter demonstration on Sunday in Cincinnati.

Protesters march through downtown Cincinnati during a Black Lives Matter demonstration on Sunday. More than 1,000 protested against the shootings of black men by police officers.

Parker Coe, 12, right, wears a Smith Strong sticker on her shirt as she helps serve hot dog plates at a fundraising event for Officer Michael Smith on Sunday in Farmers Branch, Texas. Smith was one of five officers killed Thursday by Micah Johnson during a protest in Dallas.

Protesters rally at Washington Park on Sunday in Cincinnati.

A protester listens during a rally before a Black Lives Matter march on Sunday in Cincinnati.

Jayden Terrell, 10, Josiah Scott, 5, and Jamira Terrell walk in the Do the Right Thing protest, chanting " What do we want? Do the Right Thing! When do we want it? Now!" held in downtown Jacksonville, N.C., on Saturday.

Black Lives Matter protesters walk up Riverside Avenue toward downtown in Jacksonville, Fla., on Sunday.

Protesters march to the state Capitol in Baton Rouge, La., on Sunday.

Marchers block part of Interstate 94 in St. Paul, Minn. on Saturday.

A Dallas Area Rapid Transit car and a Dallas police cruiser sit in front of Dallas police headquarters Friday, serving as a makeshift memorial honoring the officers killed Thursday night.

Law enforcement personnel walk near evidence markers at the scene of the police shootings in Dallas.

FBI agents and other law enforcement officers investigate the scene of Thursday night's shooting.

President Obama pauses while speaking about the events in Dallas at the beginning of his news conference at PGE National Stadium in Warsaw, Poland, on Saturday. AP Photo/Susan Walsh