Missouri unrest: US leaders call for calm

The violence has captured headlines around the world, raising questions about the state of US race relations.

Missouri National Guard troops are deployed to provide protection for a police command center on 19 August 2014 in Ferguson, Missouri. Picture: AFP.

FERGUSON - United States (US) lawmakers on Tuesday called for calm and a change in police tactics in the St. Louis suburb of Ferguson, which has been rocked by racially charged clashes and riots after a white officer killed an unarmed black teenager 10 days ago.

The violence has captured headlines around the world, raising questions about the state of US race relations nearly six years after Americans elected their first black president.

Law enforcement has made various efforts to soothe angry demonstrators, but police said they had come under heavy gunfire overnight and arrested 31 people despite the deployment of Missouri National Guard troops and the lifting of a curfew to allow protesters to have more freedom to demonstrate.

"We overpoliced for a few days, and then we completely underpoliced," US Senator Claire McCaskill, a Missouri Democrat who was traveling to Ferguson on Tuesday, told cable channel MSNBC.

She said she was working with local leaders on ways to quell the violence. Possible methods include screening for weapons and moving protest areas away from the business district to open green spaces.

Both she and US Representative Emanuel Cleaver, another Missouri Democrat, said calm was needed to allow federal investigators to evaluate the evidence.

"What's happening now is damaging, or interfering, with what needs to be done," Cleaver told MSNBC.

On Monday, President Barack Obama said he told Missouri Governor Jay Nixon that use of the National Guard should be limited, and he also called for conciliation. Attorney General Eric Holder plans to visit Ferguson on Wednesday.

Ferguson, a community of roughly 21,000 mostly black residents just outside St. Louis, has a long history of racial tension. Blacks have complained of police harassment and under-representation in city leadership.

Tension boiled over 10 days ago after 18-year-old Michael Brown was shot dead while walking with a friend down a residential street on the afternoon of 9 August.

The police refused to immediately release the name of the officer who killed Brown. They later identified him as 28-year-old Darren Wilson but and still have not provided details about why he fired multiple rounds at Brown.

Both the US Department of Justice and the St. Louis County Police Department are investigating the shooting. The county prosecutor's office said it could start presenting evidence to a grand jury Wednesday to determine if Wilson will be indicted.

Since the killing, thousands of protesters have taken over the site of the shooting and the nearby business district each night, chanting anti-police slogans and carrying signs calling for Wilson's arrest.

Some journalists covering the confrontations have been hit by tear gas and arrested.

On Tuesday, the Vienna-based Organization for Security and Co-operation in Europe, an intergovernmental security and human rights organization whose members include 57 countries including the United States and Canada, criticized the treatment of the journalists.