On Tuesday, Chicago officials released dash cam video showing the fatal shooting of 17-year-old Laquan McDonald, prompting protests throughout the city. McDonald was shot 16 times by former Chicago police officer Jason Van Dyke in October 2014.

RELATED: Chicago Police Release Video of Laquan McDonald's Death

McDonald was charged with first-degree murder on Tuesday following a criminal probe launched by Cook County State's Attorney Anita Alvarez. The charge came 400 days after the fatal shooting, and protestors are demanding answers from the city, which resisted releasing the video for months.

"16 shots," protestors chanted, marching down major streets and blocking traffic in the hours after Chicago Mayor Rahm Emanuel and CPD Supt. Garry McCarthy called for peace and calm at a press conference.

"Who do you serve? Who do you protect?" others called out on Michigan Avenue.

Protestors linked arms and blocked an intersection in a show of solidarity on another block, meeting at a gathering point in downtown Chicago.

"At least one person was seen being taken into custody following a confrontation involving a bicycle officer," BuzzFeed News reported.

RELATED: Chicago Officer Charged With Murder as Laquan McDonald Video Release Looms

Ever since a county judge ordered the city to release the dash cam video of the shooting last week, Chicago officials have expressed concern over the public response to the graphic footage. Emanuel emphasized that residents should "remain peaceful" following its release.