A 28-year-old man accused in a Tochigi robbery-murder case was taken into custody at Tokyo's Haneda Airport in the early hours of Sunday, shortly before his planned flight to Seoul.
Japanese police said the man was arrested as he attempted to flee to South Korea.
The case involves a robbery and murder in Kaminokawa, Tochigi, where the suspect is alleged to have instructed others.
His detention at the airport prevented any further escape.
Japanese police have issued an arrest warrant for the potential mastermind in the murder of a 69-year-old woman in Tochigi. The man fled to China after the break-in at her home.
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Four teens have been held over a robbery-murder case in Tochigi in which a 69-year-old woman was stabbed to death. The boys are suspected of meeting the alleged masterminds on the day of the crime.
Police in Kushiro, Hokkaido, have arrested a 22-year-old man on suspicion of threatening a 13-year-old female junior high student by sending messages such as "I'm going to kill you" via a social media app on Friday.
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At the request of Japanese police, INTERPOL has issued a Red Notice for 48-year-old Kazuhiko Masuda.