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 / Updated  / Source: NBC News

TOKYO — Japanese police were investigating a possible attempted rocket attack against a U.S. military base just outside of Tokyo after discovering two crudely made launchers and a projectile on Tuesday.

Police told NBC News that a resident of Zama, in central Japan, reported hearing three loud explosions at 12:43 a.m. local time on Tuesday (11:43 a.m. ET Monday).

Officers who responded to the scene near the U.S. Army's Camp Zama base found two pipes — measuring 2 inches in diameter — pointing in the direction of American facility. Police an electrical cable was found next to the pipes, along with a projectile around 660 feet away. No damage or injuries were reported, police added.

Similar incidents in 2002 and in 2007 were blamed on a left wing radical group, and police told NBC News they were investigating whether Tuesday's case was related to the same organization.

— Arata Yamamoto