other with respect and dignity. >> a brutal attack on our police force is an attack on our country and an attack on our families. we must stand in solidarity with law enforcement, which we must remember is the force between civilization and total chaos. every american has the right to live in safety and peace. chant black lives matter. other demonstrations across the nation. >> reporter: rallies on friday flooded the streets of atlanta. thousands marched peacefully through downtown and bringing traffic to a standstill after gathering at the centennial olympic park. the police chief of pittsburgh joined this crowd in a peaceful march over that city's iconic bridges. while in the nation's capital, the group black lives matter held multiple demonstrations throughout the city. >> i'm mad about everything that is going on. >> reporter: the city's police chief said despite thursday's tragic events in dallas, her force will continue to do its job, as always. >> we go out there and we do...