The protests, which were initially peaceful, became violent during Monday night. ABC News reports that protesters have smashed windows, looted stores and started fires in the city of Missouri.

Unclear who shot

The police now confirm that four Saint Louis police officers were shot during the protests. According to the authorities, the injuries should not be life-threatening. It is unclear who shot the police.

Tasks: Police officer shot in Las Vegas

At the same time, several US media reports that a US Marshal police officer was shot in the head in Las Vegas, Nevada. According to 8NewsNow.com, the police must have died from their injuries.

The United States has been shaken by widespread protests since a Minneapolis police raid that resulted in fatalities.