President Barack Obama has given statement that he is “deeply disturbed” by a police video that shows a white officer killing a black teenager by shooting 16 times in Chicago.
Officer Jason Van Dyke is charged with the first-degree murder of 17-year-old Laquan McDonald, who was stopped by police after slashing car tyres.
In a Thanksgiving message on Facebook, the president paid tribute to Chicago protesters for keeping the peace.
Four people were arrested overnight as demonstrators marched through the city.
The protests were not as widespread or as tense as Tuesday night, which began moments after police released the dashcam video showing the incident.