Japanese police questioned a university student and several others Monday over suspected plans to travel to Syria to join the Islamic State group, news reports said.
The reported investigation by Tokyo police would be the first indication of possible support within Japan for the militant group.
Tokyo Metropolitan Police declined to comment on the reports.
Public broadcaster NHK and Kyodo News service said investigators questioned a 26-year-old male Hokkaido University student and several men who shared a house with him on suspicion they were preparing to go to Syria to fight.
Interesting, considering one rarely hears about problems with Islam in Japan.