Taiwanese officials have issued an arrest warrant for OnePlus CEO Pete Lau on allegations of illegally employing workers in Taiwan. Two Taiwanese citizens who worked for Lau have also been indicted. The China-based smartphone company has been accused of illegally recruiting more than 70 engineers from Taiwan.

Members of the Shilin District Prosecutors Office claim that OnePlus reportedly set up a shell company in Hong Kong with a distinct name, then launched a branch in Taiwan in 2015 without government approval. The branch reportedly worked on research and development for OnePlus mobile phones. Taiwanese officials claim these actions by OnePlus violated the Cross-Strait Act, which is designed as a guide for relations between Taiwan and mainland China. One of the act’s provisions requires Chinese companies to obtain permission from the Taiwanese government to hire workers from Taiwan.