A young man raises his arms over his head as he shouts "Don't shoot" during the Millions March NYC on Saturday in New York City. Tens of thousands of protesters gathered in New York, Washington and Los Angeles on Saturday, stepping up demonstrations across the US demanding justice for black men killed by white police.

Hundreds of people marched in the Hollywood section of Los Angeles, with dozens staging a die-in at the CNN bureau in the latest of a series of demonstrations against officer-involved deaths of unarmed black men in Los Angeles, New York and Ferguson, Missouri as part of the Justice For All March in Washington DC on Saturday.

Protesters march on 5th Avenue during the Millions March NYC on Saturday in New York. Organizers said the marches were among the largest in the recent wave of protests against the killings of black males by police in Ferguson, Missouri, New York, Cleveland, Ohio and elsewhere.

A vendor rolls up a photo of Trayvon Martin, slain by a Florida neighborhood watchman in 2012, as another holds a smaller poster of Michael Brown during the Justice For All march Saturday in Washington, DC. A sea of demonstrators shut down parts of New York's Manhattan and Washington's Pennsylvania Avenue, which leads to the Capitol with cries of "No justice, no peace!" and "Justice Now!" Photos: IC - AFP