Protesters form a line and walk holding signs that spell out "Laquan" following the release of a dash-cam video of 17-year-old Laquan McDonald being fatally shot 16 times by Chicago Police officer Jason Van Dyke, Nov. 24 2015, in Chicago.

Demonstrators confront police during a protest following the release of a video showing Chicago Police officer Jason Van Dyke shooting and killing Laquan McDonald, Nov. 24, 2015, in Chicago.

Demonstrators listen to speakers during protests in Chicago, Nov. 24, 2015, reacting to the release of a police video of the 2014 shooting of a black teenager, Laquan McDonald, by a white policeman, Jason Van Dyke.

Demonstrators march through downtown following the release of a video showing Chicago Police officer Jason Van Dyke shooting and killing Laquan McDonald, Nov. 24, 2015, in Chicago.

A protester shouts at Chicago police officers standing guard outside the District 1 Police headquarters in Chicago, Nov. 24, 2015.

Demonstrators chant as the walk the streets during protests in Chicago, Nov. 24, 2015, reacting to the release of a police video of the 2014 shooting of a black teenager, Laquan McDonald, by a white policeman, Jason Van Dyke. Van Dyke was charged with murder in the incident.

Demonstrators form a chain near the Balboa bridge, Nov. 24, 2015, after city officials released the dash-cam video of Chicago police Officer Jason Van Dyke opening fire on 17-year-old Laquan McDonald, striking him 16 times, in October 2014.

Protesters form a circle at the intersection of South State Street and West Roosevelt Road in Chicago following the release of a dash-cam video of 17-year-old Laquan McDonald being fatally shot 16 times by Chicago Police officer Jason Van Dyke, Nov. 24 2015.

Authorities form a line to prevent protesters from entering an expressway, Nov. 24, 2015, in Chicago.

A protester and a Illinois State Trooper exchange words while police form a line to prevent protesters from entering an expressway, Nov. 24, 2015, in Chicago.

Chicago police form a line to prevent protesters from entering an expressway, Nov. 24, 2015, in Chicago.

Protesters gesture near Chicago police while trying to enter an expressway, Nov. 24, 2015, in Chicago.

Chicago Police form a line to keep a protest for 17-year-old Laquan McDonald from entering Grant Park, Nov. 25, 2015, in Chicago.

Protesters shut down a street during a protest for 17-year-old Laquan McDonald, Nov. 25, 2015, in Chicago.