Anxious residents of a St. Louis suburb Sunday awaited a grand jury's decision on whether to bring criminal charges against a white policeman who fatally shot a black teen in a case that has become a flash point for U.S. race relations.

The slaying of 18-year-old Michael Brown by officer Darren Wilson in Ferguson, Missouri, on Aug. 9, prompted weeks of demonstrations by protesters demanding Wilson be indicted.

The policeman has said he fired on the teen in self-defense, while Brown's companion has said the young man had his hands raised at the time in an act of surrender.