Police in the US state of Missouri have clashed with protesters for a fourth night amid growing anger at the fatal shooting of a black teenager by police.
Heavily armed riot police fired tear gas as they moved in on demonstrators in the St Louis suburb of Ferguson who had ignored an order to disperse.
Several people were arrested, two of them journalists who said they were assaulted before being released.
The tension was sparked by the death of Michael Brown, 18, on Saturday.
Details about the incident have been disputed but eyewitnesses said the unarmed teenager had his arms raised when he was shot multiple times by a police officer.
Police say there was a struggle and the officer suffered facial injuries.
As the outrage showed no sign of dissipating, Missouri Governor Jay Nixon said he would travel to the area on Thursday and called for “patience and calm” from members of the community.
“While we all respect the solemn responsibility of our law enforcement officers to protect the public, we must also safeguard the rights of Missourians to peaceably assemble and the rights of the press to report on matters of public concern,” he wrote in a statement.
“I am committed to ensuring the pain of last weekend’s tragedy does not continue to be compounded by this ongoing crisis.”