US President Barack Obama has urged police to respect protesters after four nights of racially charged demonstrations in Ferguson, Missouri, over the recent police killing of an unarmed black teenager.
He said this while speaking to the press from Edgartown, Massachusetts on Thursday.
"There is never an excuse for violence against police or for those who would use this tragedy as a cover for vandalism or looting," Obama said a televised remarks.
"There is also no excuse for police to use excessive force against peaceful protesters or to throw protesters in jail for lawfully exercising their first amendment rights," he said.
After the shooting death of 18-year-old Michael Brown in the St Louis suburb on Saturday, dozens of protesters have been arrested and the police have used riot gear, tear gas and rubber bullets to break up protests.
There have been peaceful vigils and demonstrations as well as episodes of looting and violence.
Governor Jay Nixon on Thursday also told community members at a church in the St Louis area that "over the next few hours we are going to be making some shifts so that people will be ... safe." He did not specify what his steps would be made.
The US Department of Justice, the FBI and the St Louis County prosecutor's office are all investigating Brown's death.
Police have said Brown struggled with the officer who shot and killed him.
Some witnesses have said Brown held up his hands and was surrendering when he was shot multiple times in the head and chest.
Two reporters were among the arrests on Wednesday night during the fourth night of protests.
Obama said: "Here in the US police should not be bullying or arresting journalists who are just trying to do their jobs."
Ferguson Mayor James Knowles told CNN: "We will make sure that reporters are treated in a proper fashion because we want you to give the entire story."
