A man is detained by police outside City Hall after defying a curfew in Baltimore, Maryland May 1, 2015 (Photo: Reuters)
A protester talks with Matthew Short, right, from an activist group called Don't Comply outside of the Frank Crowley Courts Building in Dallas on Friday, May 1, 2015 (Photo: AP)
Protestors march across Margaret Hunt Hill Bridge which police shut down to traffic, during a march in Dallas on Friday, May 1, 2015 (Photo: AP)
A police line blocks Guilford Avenue near City Hall in Baltimore, May 1, 2015 (Photo: Reuters)
Demonstrators walk down Mangum Street toward the Durham County Detention Center while protesting in solidarity with Baltimore demonstrators, Friday, May 1, 2015, in Durham, N.C. (Photo: AP)
Vosiey Cox, front center, protests with hundreds of demonstrators gathered to protest police aggression and in solidarity with Baltimore demonstrators, in front of the Durham County Jail, in Durham, N.C (Photo: AP)
A message reading "All Lives Matter" is written on the pavement as police in riot gear cast shadows while standing in line ahead of a curfew Friday, May 1, 2015, in Baltimore (Photo: AP)
Demonstrators celebrate the announcement of six officers charged in the police-custody death of Freddie Gray before a curfew goes into effect Friday, May 1, 2015, in Baltimore (Photo: AP)
Demonstrators stand on top of vehicles at the intersection of North Avenue and Pennsylvania Avenue in Baltimore, Maryland May 1, 2015 (Photo: Reuters)
Protestors make their way off the Margaret Hunt Hill Bridge, which police shut down the traffic on, during a march in Dallas on Friday, May 1, 2015 (Photo: AP)
Protesters hold a sign aloft in front of City Hall during demonstrations in Baltimore, Maryland May 1, 2015 (Photo: Reuters)
Sadé Johnson, left, hugs an emotional Mallory Rouse at Belo Garden during a march in Dallas on Friday, May 1, 2015 (Photo: Reuters)