Chicago Mayor Rahm Emanuel, left, and Police Superintendent Garry McCarthy appear at a news conference, Tuesday, Nov. 24, 2015, in Chicago, announcing first-degree murder charges against police officer Jason Van Dyke in the Oct. 20, 2014, death of
A protester yells at a police officer in Chicago.
Protesters hold hands in Chicago. Racial tensions soared in two US cities after three white men opened fire on a Black Lives Matter protest in Minneapolis and a Chicago police officer was charged with murder for shooting a black teen.
Five people were wounded, though none gravely, when the gunmen opened fire Monday night at the Minneapolis protest, police said.
Meanwhile, the mayor of Chicago called for calm ahead of the release of a "hideous" video showing officer Jason Van Dyke fire 16 bullets into Laquan McDonald.
It will be the first time a Chicago police officer has been charged with first-degree murder for an on-duty fatality in more than 30 years. In image, Chicago police officers attempt to stop protesters from crossing a street.
Dean Angelo, Fraternal Order of Police Lodge #7 president, right, talks to members of the media after a bond hearing for Chicago police officer Jason Van Dyke, on murder charges.
Rev Jesse Jackson, Fred Hampton Jr. The Rev. Jesse Jackson right, embraces Fred Hampton Jr., left, after a vigil for Laquan McDonald, in Chicago. Chicago police Officer Jason Van Dyke was charged Tuesday with first degree murder.
Protests erupt in Chicago as video of police shooting is released