Marchers Across Country Protest Police Killings

— -- Demonstrators took to the streets in dozens of cities across the country today to protest police officers killing unarmed black men.

The protesters referred to the deaths of Eric Garner in Staten Island, Michael Brown in Ferguson, Mo., and Walter Scott in South Carolina, among others.

The marches in New York City, Los Angeles, Seattle, Oakland and Berkeley, California, and other cities were organized by the Stop Mass Incarceration Network, using the hashtag #ShutDownA14 to spread their message on social media.

In New York City, several people were arrested near 1 Police Plaza -- the headquarters of the NYPD -- after protestors marched on Broadway and then to the Brooklyn Bridge, where they partially blocked traffic.

In Los Angeles, the LAPD said 15 protesters were arrested after they blocked the Blue Line tracks in downtown LA for about two hours. The protest in front of LAPD headquarters at First and Main streets began at about 3:20 p.m. Tuesday.

Protesters marched through Oakland and briefly blocked an on-ramp to Interstate 880 at around 4 p.m. Police removed the protesters and later blocked the entrance to the Jackson Street on-ramp. The crowd included students from several Oakland schools who staged walkouts today. As they marched through Chinatown, they stopped briefly by Oakland Charter Academy, claiming the school's principal had threatened to suspend students who walked out today.