SHANGHAI - Eleven people have been jailed for their roles in riots that hit a city in the southern Chinese export hub of Guangdong province last month, state media said on Saturday.The riots in mid-June, which were sparked by the abuse of a pregnant migrant street hawker, flared over three days and saw rampaging mobs smash and burn government offices, pelt police with stones and bottles and overturn scores of vehicles.A court in the city of Zengcheng on Thursday sentenced five people to terms ranging from a year and a half to nearly six years, the official Xinhua news agency said.That followed the sentencing of six other people to terms from nine months to three-and-a-half years on Monday, it said.