An otherwise peaceful day of protest was marred by a spate of violence at a Seattle May Day protest. Protesters dressed in "Black-Bloc" clothing smashed windows on Capitol Hill, bottles were thrown at police officers who in turn used pepper spray, and blast balls -- a small firework-like device that creates a flash and a modest dose of pepper spray when they would not disperse.
A total of 11 adults and two juveniles were arrested for assault or property damage.
