Kelompok-kelompok semacam itu menargetkan instalasi-instalasi militer AS di Jepang di waktu yang lalu dan perang Irak, yang mendorong polisi meningkatkan keamanan pada fasilitas-fasilitas semacam.
Such groups have targeted U.S. military installations in Japan in the past and the Iraq conflict has prompted police to step up security at such facilities.