Trump vows forceful response

What you need to know about the protests

- At least four police shot in violent protests after Trump vows to bring in US military.

- At least 5,600 people have been arrested in cities around the country since demonstrations broke out.

- Protests enter seventh day across the US, including fires, violence near White House.

- The nationwide unrest started on Memorial Day, May 25, when George Floyd, 46, died after a Minneapolis police officer knelt on his neck for almost nine minutes

- An autopsy commissioned for Floyd's family found that he died of asphyxiation from neck and back compression. That distinguishes it from the official autopsy, which said he died from the effects of being restrained along with underlying health problems and potential intoxicants in his system.

- At least 40 cities in more than 20 US states and Washington DC have imposed curfews.

- National Guard members have been activated in at least 23 states and Washington DC.