Demonstrators gather at Aurora City Hall during a protest over the death of George Floyd in Aurora, an outer suburb of Chicago, the United States, on May 31, 2020. Chicago Mayor Lori Lightfoot on Sunday once again set strict parameters for the city effort to contain another night of protesting. Chicago's precautions followed a chaotic and violent Saturday evening, when many businesses along the streets were looted, police cars overturned and some properties damaged. (Photo by Ethan Chivari/Xinhua)

People take part in a protest over the death of George Floyd in Aurora, an outer suburb of Chicago, the United States, on May 31, 2020. Chicago Mayor Lori Lightfoot on Sunday once again set strict parameters for the city effort to contain another night of protesting. Chicago's precautions followed a chaotic and violent Saturday evening, when many businesses along the streets were looted, police cars overturned and some properties damaged. (Photo by Ethan Chivari/Xinhua)

Police block off a street during a protest over the death of George Floyd in Aurora, an outer suburb of Chicago, the United States, on May 31, 2020. Chicago Mayor Lori Lightfoot on Sunday once again set strict parameters for the city effort to contain another night of protesting. Chicago's precautions followed a chaotic and violent Saturday evening, when many businesses along the streets were looted, police cars overturned and some properties damaged. (Photo by Ethan Chivari/Xinhua)

Demonstrators march to Aurora City Hall during a protest over the death of George Floyd in Aurora, an outer suburb of Chicago, the United States, on May 31, 2020. Chicago Mayor Lori Lightfoot on Sunday once again set strict parameters for the city effort to contain another night of protesting. Chicago's precautions followed a chaotic and violent Saturday evening, when many businesses along the streets were looted, police cars overturned and some properties damaged. (Photo by Ethan Chivari/Xinhua)

A protester marches to Aurora City Hall during a protest over the death of George Floyd in Aurora, an outer suburb of Chicago, the United States, on May 31, 2020. Chicago Mayor Lori Lightfoot on Sunday once again set strict parameters for the city effort to contain another night of protesting. Chicago's precautions followed a chaotic and violent Saturday evening, when many businesses along the streets were looted, police cars overturned and some properties damaged. (Photo by Ethan Chivari/Xinhua)

Demonstrators gather at Aurora City Hall during a protest over the death of George Floyd in Aurora, an outer suburb of Chicago, the United States, on May 31, 2020. Chicago Mayor Lori Lightfoot on Sunday once again set strict parameters for the city effort to contain another night of protesting. Chicago's precautions followed a chaotic and violent Saturday evening, when many businesses along the streets were looted, police cars overturned and some properties damaged. (Photo by Ethan Chivari/Xinhua)