As darkness fell on Ferguson, Missouri, the crowd of several hundred people protesting the fatal police shooting of an unarmed black teen quickly and radically changed.
The crowd shrunk as many of the older people slipped away. Protest hymns were replaced by the shouts of angry teens who marched against a cordon of heavily armed police blocking the street.
By the end of another night of violence, dozens of people had been arrested, marking the latest outbreak of rancor in the St. Louis suburb, where calls for peaceful protests have been overshadowed by episodes of looting, arson and clashes with police over the last 10 days.