On Wednesday Pyongyang announced it was 'carefully examining' an operational plan to launch a ballistic missile strike in the areas around Guam.
On Thursday, the North said they are "seriously examining" that plan.
Extra details were announced on North Korean state media, saying that the plan entails launching four Hwasong-12 intermediate range ballistic missiles.
It said the rockets will travel over Japan, exactly 3,356.7 kilometers for 1,065 seconds, and hit the waters around Guam, 30 to 40 kilometers away from the island.
Reiterating Wednesday's statement, the purpose of the strike is said to be to deter U.S. military assets from mobilizing from the island AND to send a message to Washington.
The plan, it said, is set to be finalized and reported to Kim Jong-un by mid-August.
The statement also slammed recent comments made by U.S. President Donald Trump.
Pyongyang called Trump's threats of 'fire and fury' a 'load of nonsense', saying that he 'failed to grasp the gravity of the situation.'
It added that 'sound dialogue is not possible with such a guy bereft of reason' and that 'only absolute force can work on him'.
South Korea's Joint Chiefs of Staff have issued a strong response to Pyongyang's threat toward Guam and other recent threats to South Korea and the U.S.
They said it is a serious challenge to the Korean people and the South Korea-U.S. alliance and warned the regime against carrying out any action.
"If North Korea ignores our warning and carries out this provocation, they will face strong and firm punishment from our military and the South Korea-U.S. alliance."
South Korea's Presidential Office of Cheong Wa Dae also announced that that it would hold an emergency meeting of the National Security Council, Thursday afternoon, to discuss North Korea's recent threats.
Kwon Jang-ho, Arirang News.