China likely behind cyberattacks: Japan

Tokyo police are investigating cyberattacks on about 200 Japanese companies and research organisations, including the country's space agency, by a hacking group believed to be linked to the Chinese military.

Police have forwarded the case involving attacks on the Japan Aerospace Exploration Agency to prosecutors for further investigation, Chief Cabinet Secretary Katsunobu Kato told reporters.

Police believe a series of hacks of JAXA were conducted in 2016-2017 by Tick, a Chinese cyberattack group under the direction of a unit of the People's Liberation Army, Kato said.

A suspect in the JAXA case, a Chinese systems engineer based in Japan, allegedly gained access to a rental server by registering himself under a false identity to launch the cyberattacks, Kato said on Tuesday.

NHK public television said another Chinese national with suspected links to the PLA unit who was in Japan as an exchange student was also investigated in the case. Both men had since left the country, it said.

Police are investigating the attackers' intent and methods, while also pursuing scores of other cyberattacks that they suspect are linked to China's military, Kato said.

"The involvement of China's People's Liberation Army is highly likely," Kato said. He said no actual data leak or damage had been found so far but police were urging the companies to strengthen their protection.

Japan's defence ministry says cyberattacks are part of rising security threats from China as it becomes more assertive in the region - a shared concern discussed in April 16 talks at the White House between US President Joe Biden and Japanese Prime Minister Yoshihide Suga.

In Beijing, Chinese Foreign Ministry spokesperson Wang Wenbin said cyberattacks were a common challenge faced by all countries and warned Japan against wrongly accusing China.