A coal miner was served murder charges by Zambian authorities in connection to the killing of a Chinese supervisor at a protest over low wages at the Collum coal mine, Reuters reported a police official as saying. Another supervisor was severely injured in the dispute, labor minister Fackson Shamenda said. “We have charged one person with murder and 11 others with rioting and theft,” Southern Province police chief Fred Mutondo told Reuters. Authorities are looking for three other men on suspicion of being involved in the murder, he said. The Chinese embassy in Zambia has demanded that the killing be thoroughly investigated and the perpetrators appropriately dealt with. China has also insisted on enhancing security measures to avoid similar incidents in the future.