A demonstrator sits on the roadway during a protest against police brutality against minorities, in New York April 14, 2015. Protesters angered by fresh cases of police violence against unarmed black men in the United States gathered on Tuesday in New York City in a protest organized by the group “Stop Mass Incarceration Network” hoping to invigorate a national discussion on the thorny issue. (Photo by Brendan McDermid/Reuters)

Demonstrators climb over a fence during a protest against police brutality against minorities in New York, April 14, 2015. (Photo by Shannon Stapleton/Reuters)

Demonstrators climb over a fence during a protest against police brutality against minorities in New York, April 14, 2015. (Photo by Shannon Stapleton/Reuters)

Demonstrators are escorted by the NYPD off the Brooklyn Bridge roadway during a protest against police brutality against minorities in New York, April 14, 201. (Photo by Shannon Stapleton/Reuters)

Demonstrators stop traffic on the Brooklyn Bridge during a protest against police brutality against minorities, in New York April 14, 2015. (Photo by Brendan McDermid/Reuters)

A demonstrator is detained by NYPD officers on the Brooklyn Bridge roadway during a protest against police brutality against minorities, in New York April 14, 2015. (Photo by Brendan McDermid/Reuters)

Demonstrators stop traffic on the Brooklyn Bridge during a protest against police brutality against minorities, in New York April 14, 2015. (Photo by Brendan McDermid/Reuters)

A demonstrator sits on a road during a protest against police brutality against minorities, in New York April 14, 2015. (Photo by Brendan McDermid/Reuters)

A news photographer is knocked down by a NYPD officer (unseen) as another police officer approaches him during a protest against police brutality against minorities, in New York April 14, 2015. (Photo by Brendan McDermid/Reuters)

Demonstrators stop traffic on the Brooklyn Bridge during a protest against police brutality against minorities, in New York April 14, 2015. (Photo by Brendan McDermid/Reuters)

Demonstrators protest against police brutality against minorities, in New York April 14, 2015. (Photo by Brendan McDermid/Reuters)

Demonstrators stop traffic on the Brooklyn Bridge during a protest against police brutality against minorities, in New York April 14, 2015. (Photo by Brendan McDermid/Reuters)

Demonstrators climb on the Brooklyn Bridge during a protest against police brutality against minorities, in New York April 14, 2015. (Photo by Brendan McDermid/Reuters)

Children participate in a protest against police brutality against minorities, in New York April 14, 2015. (Photo by Brendan McDermid/Reuters)

Children participate in a protest against police brutality against minorities, in New York April 14, 2015. (Photo by Brendan McDermid/Reuters)

Officers watch protesters rally outside police headquarters during a demonstration against police violence in Oakland April 14, 2015. About 50 demonstrators marched through the city with some writing the anti-police messages in chalk after briefly shutting down a freeway on-ramp. (Photo by Noah Berger/Reuters)

About fifty demonstrators march to protest police violence against minorities in Oakland April 14, 2015. (Photo by Noah Berger/Reuters)

Police officers remove demonstrators from a freeway on-ramp during a protest against police violence in Oakland April 14, 2015. (Photo by Noah Berger/Reuters)

Police officers remove demonstrators from a freeway on-ramp during a protest against police violence in Oakland April 14, 2015. (Photo by Noah Berger/Reuters)