Photo/Illutration In a statement posted on the Chinese Weibo social media site on Aug. 26, the Japanese Embassy in Beijing complains about harassing phone calls from China to Japan, calling them “criminal acts.”

A rock and several eggs were thrown at Japanese schools in China amid backlash against Tokyo’s controversial release of treated radioactive water from the stricken Fukushima nuclear plant.

A Chinese man was detained for hurling a rock at a school for Japanese children in Qingdao, in the eastern province of Shandong, on the evening of Aug. 24, according to Japanese government officials.

On the morning of Aug. 25, officials at another Japanese school in Suzhou, west of Shanghai, found eggs thrown into the school compound.

No injuries or damage to property have been reported in these two incidents. Japanese consulates general in China urged local authorities to strengthen security around Japanese facilities there.

Chinese social media has been flooded with protests against Japan due to the treated water release from the crippled Fukushima No. 1 nuclear power plant, which started on Aug. 24.

Restaurants in Fukushima Prefecture have also received harassing phone calls from China, which are believed to be related to the water discharge. The Japanese Embassy in Beijing urged the Chinese government to take strict legal measures against such callers.

It also advises Japanese citizens in China to be vigilant for hostile acts.

China imposed a blanket ban on Japanese seafood imports immediately after the start of the water release, calling the effort an extremely selfish act that disregards the international public interest.

(This article was written by correspondents Sotaro Hata in Beijing and Ryo Inoue in Shanghai.)