Japan began releasing a second batch of treated radioactive water from the wrecked Fukushima No. 1 nuclear plant on Thursday, the plant's operator said, as tensions with neighboring countries over the move continue to fester.

Tokyo Electric Power Company Holdings (Tepco) started the process at around 10:20 a.m.

“We would like to continue approaching this with the utmost caution,” Kenichi Takahara, a spokesperson for Tepco, said on Friday. “It is crucial to maintain a strong determination to safely proceed ... while making every effort to avoid causing dissatisfaction.”