[NYTIMES] Gunfire began to ring out, the police said, as rival groups began shooting at each other. The St. Louis County Police said that Trevion Hopson, a 17-year-old, was arrested after firing on a protest crowd on West Florissant Avenue, the center of the protests, around midnight. The police said that Mr. Hopson was being held and a 22-year-old man was found injured with a gunshot wound to his arm.If Obama had a son he'd look like Trevion.