Japan put its military on alert on Monday for a possible North Korean ballistic missile launch, ordering naval destroyers and anti-ballistic missile Patriot batteries to be ready to shoot down any projectile heading for Japan.
A government official confirmed that an order was issued. The official declined to be identified as he is not authorized to speak to the media.
The order was first reported by state broadcaster NHK. A spokesman for the Ministry of Defense earlier declined to comment, as did South Korea's defense ministry.
Japan has put its anti-ballistic missile forces on alert at least twice this year after detecting signs of launches by North Korea.
North Korea conducted its fourth nuclear test in January and has followed that with test launches of various missiles.
Japan has advanced Aegis vessels in the Sea of Japan that are able to track multiple targets and are armed with SM-3 missiles designed to destroy incoming warheads in space before they re-enter the atmosphere and fall to there targets.
Patriot PAC-3 missile batteries, designed to hit warheads near the ground, are deployed around Tokyo and other sites as a second and final line of defense.
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