Japan has complained to China after local businesses and institutions were inundated with abusive phone calls over the Fukushima nuclear plant discharge.
The calls come from numbers with Chinese dialling codes. One restaurant chain in Fukushima reported more than 1,000 calls since last Thursday.
Tokyo has also warned citizens visiting China to take precautions and avoid speaking Japanese loudly.
Beijing has led criticism of last week's release of treated wastewater.
Tokyo has made daily reports, saying the seawater around the nuclear plant is showing no detectable levels of radioactivity.
Japan has complained to China after local businesses and institutions were inundated with abusive phone calls over the Fukushima nuclear plant discharge.
The calls come from numbers with Chinese dialling codes. One restaurant chain in Fukushima reported more than 1,000 calls since last Thursday.
Tokyo has also warned citizens visiting China to take precautions and avoid speaking Japanese loudly.
Beijing has led criticism of last week's release of treated wastewater.
Tokyo has made daily reports, saying the seawater around the nuclear plant is showing no detectable levels of radioactivity.