DHAKA: The US state of Missouri has ordered more troops to the Ferguson area to quell unrest after a policeman was cleared over Michael Brown's killing.

State governor Jay Nixon said 2,200 National Guard would be deployed in and around the St Louis suburb on Tuesday, reports BBC.

Meanwhile officer Darren Wilson said he had a "clean conscience" over his actions, in his first public comments.

Violent protests erupted after Monday's ruling, with buildings and vehicles set alight and dozens of arrests.

Mr Brown, 18, was shot several times by Officer Wilson on 9 August in Ferguson, Missouri, sparking weeks of unrest. The grand jury's decision means the police officer will not face state criminal charges into the shooting.

Lawyers for the black teenager have denounced the grand jury's decision as "unfair".

'No excuse'

The BBC's Michelle Fleury in Ferguson says the situation in the town is a far cry from some of the scenes seen last night when tear gas filled the streets.

She describes people standing peacefully outside the main police station, with families and young children.

The number of troops in Ferguson on Tuesday is up from 700 deployed the previous night, who failed to prevent what one police chief described as the worst violence the town had ever seen.

Speaking from Chicago on Tuesday, President Barack Obama said there was "no excuse" for destructive behaviour and criminal acts of rioting, adding that those responsible should be prosecuted.

BDST: 0839 HRS, NOV 26, 2014