Chinese police have detained four workers of the Taiwanese iPhone maker, Foxconn, in circumstances Taipei has described as "strange".
The employees were arrested in Zhengzhou in Henan province on "breach of trust" charges, Taiwan's Mainland Affairs Council said in a statement.
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Taiwanese authorities suggested the detentions may be a case of "abuse of power" by Chinese police officers.
And said the case undermines the confidence of businesses operating in China.
In October last year, China's tax and land authorities launched an investigation into the company.
At that time, Foxconn's founder Terry Gou was running as an independent candidate in Taiwan's presidential election.
Taiwan has urged its citizens to "avoid non-essential travel" to the mainland as well as Hong Kong and Macau after China unveiled guidelines in June detailing criminal punishments for what Beijing described as diehard "Taiwan independence" separatists.
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