On Aug. 10, police arrested a 33-year-old man over a bomb threat to Air China's Tokyo office last week after the South Korean resident in Japan turned himself in to police in Kanagawa Prefecture.

On Aug. 10, Yokohama resident Lee Hyon Sa went to a police station there and claimed responsibility for the crime, the police said.

On Aug. 8, a China-bound Air China jetliner returned to Japan and four other flights were briefly suspended at Japanese airports before the opening ceremony of the Beijing Olympic Games as a result of the bomb threat.

Air China's Tokyo office received an email message threatening that aircraft would be blown up unless the Chinese airline stopped its operations, according to Japan's Ministry of Land, Infrastructure, Transport and Tourism.