Demonstrators protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

Demonstrators protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

Demonstrators clash with police during a protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

Demonstrators clash with police during a protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

Demonstrators protest over the death of George Floyd in front of Trump Tower in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

A demonstrator is detained by the police during a protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

Demonstrators clash with police during a protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

Demonstrators clash with police during a protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

Police stand guard with Trump Tower in the background during a protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

Demonstrators clash with police during a protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

A demonstrator holds a placard during a protest over the death of George Floyd in front of Trump Tower in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

Demonstrators clash with police during a protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

Demonstrators protest over the death of George Floyd in front of Trump Tower in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)

Demonstrators protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. 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 Christopher Dilts/Xinhua)