Police officers stand guard outside New Scotland Yard as protesters take part in a demonstration in London, Britain, on June 3, 2020. Thousands of people gathered in London on Wednesday to protest over the death of George Floyd, an unarmed black man suffocated to death by a white police officer in the mid-western U.S. state of Minnesota last week. (Photo by Ray Tang/Xinhua)

People take part in a demonstration in London, Britain, on June 3, 2020. Thousands of people gathered in London on Wednesday to protest over the death of George Floyd, an unarmed black man suffocated to death by a white police officer in the mid-western U.S. state of Minnesota last week. (Photo by Ray Tang/Xinhua)

People take part in a demonstration in London, Britain, on June 3, 2020. Thousands of people gathered in London on Wednesday to protest over the death of George Floyd, an unarmed black man suffocated to death by a white police officer in the mid-western U.S. state of Minnesota last week. (Photo by Ray Tang/Xinhua)

A man chants slogans during a demonstration in London, Britain, on June 3, 2020. Thousands of people gathered in London on Wednesday to protest over the death of George Floyd, an unarmed black man suffocated to death by a white police officer in the mid-western U.S. state of Minnesota last week. (Photo by Ray Tang/Xinhua)

Two policemen kneel down in front of protesters outside Downing Street in London, Britain, on June 3, 2020. Thousands of people gathered in London on Wednesday to protest over the death of George Floyd, an unarmed black man suffocated to death by a white police officer in the mid-western U.S. state of Minnesota last week. (Photo by Ray Tang/Xinhua)

People take part in a demonstration in London, Britain, on June 3, 2020. Thousands of people gathered in London on Wednesday to protest over the death of George Floyd, an unarmed black man suffocated to death by a white police officer in the mid-western U.S. state of Minnesota last week. (Photo by Ray Tang/Xinhua)

A woman takes part in a demonstration in London, Britain, on June 3, 2020. Thousands of people gathered in London on Wednesday to protest over the death of George Floyd, an unarmed black man suffocated to death by a white police officer in the mid-western U.S. state of Minnesota last week. (Photo by Ray Tang/Xinhua)