Multiple arrests have been made overnight in Chicago and New York during protests over police shootings of two black males, US media reported.
In Chicago, several people were arrested after protesters began taking lights off a Christmas tree in Millennium Park, local NBC affiliate WMAQ reported on Thursday (local time).
The broadcaster said authorities did not say how many arrests were made, but newspaper USA Today said two protesters had been detained as of 10.30pm local time on Wednesday.
CNN reported that some 100 to 200 demonstrators were still walking through downtown streets before dawn on Thursday following a second night of protests.
Racial tensions flared in Chicago after officials released a graphic video on Tuesday of a police officer shooting a black teen 16 times.
The dashcam video, shot in October 2014 from an approaching cruiser, shows officer Jason Van Dyke open fire on Laquan McDonald, 17.
The Chicago Tribune reported on Wednesday that it had obtained the video from four other police vehicles, including Van Dyke's, following an open record request to Mayor Rahm Emanuel.
Police in New York said protesters rallying against the same shooting had entered the Macy's department store at Herald Square and also tried blocking the Lincoln Tunnel at one point, according to local CBS affiliate WCBS.
CNN reported that "several" people had been arrested while WCBS said that six had been detained by late on Wednesday on disorderly conduct charges.
The New York demonstrators were also rallying against a recent incident in Minneapolis in which five people were shot during a Black Lives Matter protest.
The five were part of a crowd demonstrating against the fatal police shooting of Jamal Clark, 24. Police say Clark died in a struggle with officers on November 15 but witnesses say he was handcuffed at the time.
Four people remain in custody over the Black Lives Matter shooting, Minneapolis police said.