A US Navy strike group will be moving towards the western Pacific Ocean near the Korean peninsula, a US official told Reuters on Saturday.

The moves comes as concerns grow about North Korea's advancing weapons program. Earlier this month North Korea tested a liquid-fueled Scud missile which only travelled a fraction of its range.

The Carl Vinson strike group, which includes an aircraft carrier, will make its way from Singapore towards the Korean peninsula, according to the official, who spoke on condition of anonymity.

"We feel the increased presence is necessary," the official said, citing North Korea's worrisome behaviour.

This year North Korean officials, including leader Kim Jong Un, have repeatedly indicated an intercontinental ballistic missile test or something similar could be coming, possibly as soon as April 15, the 105th birthday of North Korea's founding president and celebrated annually as "the Day of the Sun."