Zambian police are investigating claims that managers at a Chinese-run coal mine in the south of the country shot and wounded at least 11 miners.
Reports say the Chinese managers had opened fire on Friday because they felt threatened by miners who protested about their working conditions.
No-one has been charged so far after the shooting at the Collum mine.
China has invested heavily in the Zambian economy but this has led to some worker resentment.
In 2006, an opposition presidential candidate campaigned openly on an anti-foreigner platform and did well in areas where the Chinese presence was most visible.
BBC News
