Live: Protests against racism and police violence continue in the U.S. 美国多地持续抗议种族歧视

Protests over the killing of African-American man George Floyd continue across the United States. Floyd, who was unarmed, died after police officer Derek Chauvin knelt on his neck in Minneapolis on May 25. U.S. prosecutors on Wednesday upgraded the charge against Chauvin to second-degree murder. #GeorgeFloyd #BlackLivesMatter