China said Monday six Japanese nationals have been detained for their suspected involvement in "illegal activities," without elaborating on the exact allegations or other details.The confirmation of their status came after a Japanese government source first revealed that the six, all men, were detained in March, fueling speculation that they could have been held on suspicion of endangering national security, the allegation China increasingly applies to foreigners.Japan's top government spokesman Yoshihide Suga told a press conference in Tokyo that officials are providing "necessary assistan…READ FULL ARTICLE