japan:North Korea threatned  america to attack US submarine that deployed in South Korean waters.

The guided missile submarine USS Michigan has been joined by the USS Carl Vinson aircraft carrier group in waters near the Korean peninsula.

The website added that "whether it's a nuclear aircraft carrier or a nuclear submarine, they will be turned into a mass of scrap metal in front of our invincible military power centred on the self-defense nuclear deterrence."

The aircraft carrier group began exercises with the South Korean navy on Sunday after it completed drills with the Japanese navy.

Remember the tensions between  america and north korea over atmic issue ha rise day by day