SHANGHANG, Fujian - Two more local environmental officials have been detained for their inadequate supervision in the recent toxic wastewater leakage at a copper mine in Shanghang county of East China's Fujian province, local prosecutors said on Tuesday.

Bao Weidong and Wu Shenglong, director and deputy director of the Zijinshan environmental supervision station, have been held in criminal custody for dereliction of duty since the weekend, said procuratorate officials of Longyan city, which administrates Shanghang county.

The station is responsible for checking the validity of the Zijinshan Copper Mine's wastewater treatment system.