Two small explosions were heard late Monday near the headquarters of the U.S. army in Japan. Police suspect it may have been an attack involving leftist radicals.
Police quoted by Japans Kyodo news agency say no one was injured by the blasts, which occurred late Monday outside Camp Zama, a U.S. military base near Tokyo.
The police and U.S. military officials say that a metal pipe used as a projectile launcher was found in the area, at a public park outside of the base. An army spokesman says two suspects were believed to be in custody. Because the explosions occurred off-base, Japanese police are handling the investigation.
Kyodo says Japanese officials suspect leftist radicals may be involved. They have targeted U.S. military installations in the past. However, there is no evidence that the attack was directed against the base.
There are 50,000 U.S. troops stationed in Japan under a mutual security agreement.