Japanese police arrested a 27-year-old unemployed man on May 12 over bomb threats sent to Nintendo's headquarters in Kyoto, after the company reported the threats in March and officers found no explosives at the site. [1, 2, 3, 4]

The suspect admitted sending the letters, which said, "I'm going to blow you all up" and claimed that "multiple bombs" had already been planted, police and reports said. [1, 2, 3, 4]

The threats were delivered in envelopes, and police searched the premises after Nintendo alerted authorities on March 16. Officers found no explosives or dangerous devices. [1, 2, 3, 4]

Police are still investigating the suspect's motive, and no public explanation has been established. The case is being handled as a charge of obstructing or disrupting business. [1, 2, 4]