[BBC] – Crowds have rallied across the US to protest against Monday’s decision not to charge a policeman over the killing of black teen Michael Brown … rioting broke out in Oakland, California.

In and around the St Louis suburb of Ferguson, scene of major riots on Monday, 2,200 National Guard troops were deployed to stop further unrest.

The white officer who killed Mr Brown there says he has a “clean conscience”.

Darren Wilson shot the 18-year-old on 9 August, sparking weeks of unrest in the Missouri town.

Many in Ferguson’s predominantly African-American community had called for the officer to be charged with murder, but the grand jury’s decision means the police officer will not face state criminal charges over the shooting.