Reports say the missile-armed USS Michigan is set to join an incoming group of warships led by aircraft carrier Carl Vinson.
North Korea is celebrating 85th founding anniversary of its army today, and emerging reports suggest it has marked the event with its largest ever firing drill.
Tensions have risen on the Korean peninsula in recent weeks, as US and North Korea exchange heated rhetoric.
Meanwhile; officials from South Korea, the US and Japan are meeting in Tokyo to discuss the threat posed by North Korea.
