"The US government must do more to ensure policing practices nationwide are brought into line with international human rights standards, including the use of lethal force, and to address systemic racial discrimination," the statement read.
On Monday, a grand jury decided not to indict Darren Wilson, a white police officer who shot and killed African-American teenager Michael Brown while off duty in the St. Louis suburb of Ferguson on August 9.
Brown's killing sparked weeks of often-violent protests in the city and across the country. A new wave of protests erupted Monday following the grand jury's decision. Police have been criticized for using heavy-handed tactics to quell the protests.
According to local media outlets, over the last two days, at least 24 people have sought professional medical help in St. Louis, Missouri, where the latest protests erupted.