Brick thrown at Japan embassy in China in Fukushima spat

Japan said Tuesday that harassment being faced by Japanese in China after the release of water from the Fukushima nuclear plant was "extremely regrettable", confirming that a brick was thrown at his country's embassy in Beijing.

Last week, China banned all seafood imports from its neighbour as Japan began releasing treated wastewater from the crippled plant in an operation Tokyo and the United Nation's nuclear watchdog have said is safe.

Since then, Japan has urged its citizens in China to keep a low profile and has increased security around schools and diplomatic missions.

Japan's foreign minister on Tuesday confirmed media reports that a brick was thrown at its embassy in Beijing and echoed calls from Prime Minister Fumio Kishida on Monday to China to take action to calm the situation.

"It is extremely regrettable and worrying," Yoshimasa Hayashi told reporters in Tokyo.

"We would like to urge the Chinese government again to take appropriate measures immediately, such as calling on its citizens to act calmly to prevent the situation from escalating, and to take all possible measures to ensure the safety of Japanese residents and our diplomatic missions in China," he said.

He added that China should "provide accurate information" about the Fukushima water release "rather than unnecessarily raising people's concerns by providing information without any scientific basis".

In Beijing, a spokesperson at the Japanese embassy told AFP that staff were "extremely worried".

"Some individuals have come to our (embassy) entrance," the spokesperson said.

"They took these kinds of actions then were led away by armed police."

Asked what action Beijing would take over the stone-throwing, foreign ministry spokesman Wang Wenbin said Monday that China "always protects the safety and legitimate rights and interests of foreigners in China, in accordance with law".

"We strongly urge the Japanese side to face up to the legitimate concerns of all parties, immediately stop the discharge of nuclear-contaminated water into the sea, fully consult with its neighbours and other stakeholders, and earnestly dispose of nuclear-contaminated water in a responsible manner," Wang told a regular briefing.

Test results from seawater and fish samples near the plant since the start of the discharge -- which will take decades to complete -- have confirmed this, according to Japanese authorities.

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