Tokyo police arrested two Japanese men on suspicion of fraud on their flight back to Japan from the Philippines early Thursday. The pair are among four Japanese who are suspected of orchestrating a series of robberies across Japan.

Watanabe Yuki and Kojima Tomonobu had been held at an immigration facility in the Philippines.

Police say the two are suspected of stealing cash cards from a man in Tokyo in November 2019, pretending to belong to the Financial Services Agency. They reportedly told the victim that illegal balance inquiries had been made regarding his bank accounts.

The two others -- Fujita Toshiya and Imamura Kiyoto -- were extradited from the Philippines on Tuesday.

Police suspect the four are senior members of a group involved in phone scams that netted more than 6 billion yen, or about 45.7 million dollars.

They aim to shed light into the organization as well as learn whether the men are behind a robbery spree in Japan that left one person dead.