There have been protests in cities across America, after the acquittal of George Zimmerman, the man who shot dead an unarmed black teenager.
Zimmerman was cleared of murder by a Florida jury.
The largest rally took place on Sunday night in New York and lasted until early Monday morning
More than a dozen people were arrested in New York and Los Angeles when they refused to move.
Protesters have vowed to continue their vigils next weekend.
In February 2012 Zimmerman saw 17 year old Trayvon Martin outside a gated community in the central Florida town of Sanford.
He called police to report him, then approached with a pistol in his waistband. There was a fight and Zimmerman shot Martin once in the heart.
Zimmerman’s lawyers argued he acted in self-defence ,
President Obama has appealed for calm, saying the death was a tragedy for America, but that “a jury has spoken”.