Chinese mine manager Wu Shengzai was killed by protesting miners after being hit by a trolley. The trolley was pushed toward him by rioting miners as they ran underground seeking refuge, according the BBC News Africa. A second Chinese manager was injured, as were several Zambians, during the riot. The workers were on strike at the mine in protest against delays in implementing a new minimum wage. They were angry their wages were lower than a new minimum of $220 a month paid to shop workers. The Chinese-owned Collum coal mine is located in Sinazongwe, 325 km south of the Lusaka. Last year, the Zambian government dropped charges against two Chinese managers accused of attempted murder after they fired on miners at the Collum mine during a pay dispute.