They were extradited from the Philippines. That's where they allegedly coordinated the crimes with another pair of Japanese nationals, who may also soon face extradition.
Fujita Toshiya and Imamura Kiyoto were arrested mid-flight from Manila to Tokyo. They were being held at an immigration facility in the Philippines along with the other two suspects.
The four men are facing charges for allegedly running a telephone scam, but they're also suspected of organizing a string of robberies across 14 Japanese prefectures.