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When two Brussels police officers stopped a Moroccan motorcycle rider in an immigrant neighborhood for disturbing the peace last week, their action sparked the worst rioting the quiet capital has witnessed in years. The officers asked the rider to show some identification, and soon local Moroccans, who saw the incident as just the latest in a long campaign of police harassment, were throwing fire bombs and stones. By the next day hundreds of Arabs smashed windows at a nearby police station. Riots raged in immigrant neighborhoods for the three nights that followed, and though no fatal injuries were reported, the...