A riot involving 2,000 workers at a factory in the northern Chinese city of Taiyuan on Sunday night once has once again shined a light on conditions at factories owned by Apple Inc. supplier Foxconn. The cause of the riot appears to have been a fight between workers that somehow escalated into larger-scale unrest. While the precise dynamics that led workers in the factory to run rampant remain unclear, it’s noteworthy that news of the incident comes with Apple recently announcing that advance sales of its iPhone5 have broken all previous records.