(Yicai) July 3 -- Bilibili and a number of Chinese internet companies are ramping up their internal anti-corruption efforts, as they seek to trim costs and boost efficiency amid slowing growth in the tech sector. This crackdown has resulted in a string of arrests and police probes.

Zhang Zaimin, the former general manager of Bilibili’s game co-operation department, has been arrested by police for committing serious job-related offences while in office, the Shanghai-based company said in an internal email yesterday.

Zhang was a high-level manager in the firm's gaming operations, The Paper reported today, citing a company insider. Before joining Bilibili, she worked at UK lender HSBC and Chinese tech giant Huawei Technologies.

Gaming has been one of Bilibili’s main sources of revenue for a long time. In the first quarter, its gaming revenue surged 76 percent from a year earlier to CNY1.7 billion (USD237.3 million), accounting for 24 percent of the firm’s total income for the period. This strong performance helped the company return to profitability on a non-GAAP basis, with an adjusted net profit of CNY361.5 million (USD50.5 million).

Just a day before Bilibili’s announcement, game developer Perfect World also said that eight employees in three of its game studios were found to have accepted bribes from suppliers, harming the Beijing-based company’s interests. Several of them have already been taken into police custody. The four suppliers involved in the scandal have been blacklisted permanently, it added.

On June 22, there were also media reports that Feng Jialu, vice president of marketing at e-commerce firm Vipshop, was under police investigation for alleged large-scale corruption. And Han Liu, the ex-chief executive officer of food delivery giant Ele.me, was also taken away by the police on suspicion of job-related crimes earlier that month.

Editors: Dou Shicong, Kim Taylor