Police officers patrol a street in Ferguson, Missouri August 11, 2014. Police fired tear gas after rioting broke out for a second night in Ferguson, Missouri, despite calls on Monday for calm from the mother of a black teenager who was shot to death by police at the weekend. Michael Brown, 18, was shot to death in the mostly black St Louis suburb on Saturday afternoon after what police said was a struggle with a gun in a police car. REUTERS/Mario Anzuoni (UNITED STATES - Tags: CRIME LAW)