In Minnesota, the mayor of Minneapolis says four police officers involved in the death of a black man while in police custody have been terminated.

DAVID GREENE, HOST:

There were protesters clashing with police and stopping traffic in Minneapolis last night; this after the death of George Floyd.

But outrage spilled into the streets after Floyd, a black man, died in police custody on Monday night.

There was video widely shared on social media showing a police officer using his knee to pin Floyd's neck to the ground for several minutes.

That's where the video picks up, showing police on top of him, including - as you said - a white officer with a knee on Floyd's neck and his back.