LUSAKA (AFP) - Stone-throwing mobs smashed cars and blocked roads during voting Tuesday in Zambias capital, after opposition leader Michael Sata accused President Rupiah Bandas rival camp of rigging the ballot. Crowds of mainly young people set flaming tyres in the streets, smashed cars belonging to elections officials, broke windows at a school, and threw stones at police who tried to charge the mobs from their vehicles. Police declined to comment but AFP reporters saw at least four people being arrested. The unrest was scattered around the city.