Prosecutors in Ferguson, Missouri, have charged a man with assaulting officers during events marking the first anniversary of the killing of unarmed black teenager Michael Brown.
They named the suspect as Tyrone Harris, 18, who was critically wounded in a gun battle with police on Sunday.
The authorities have declared a state of emergency in the city.
Michael Brown’s death triggered a wave of demonstrations over the use of excessive force by police officers.
Brown, 18, was shot in August 2014 by white police officer Darren Wilson, who was later cleared of any wrongdoing by a grand jury and the US Department of Justice.