The official added that the South Korean government had assured the US that it would not revert from its previous commitments regarding the missile defense system, and that the United States had given South Korea the same assurances.
Kim Dong-yub, a North Korea expert at Seoul's Institute for Far Eastern Studies, said the projectiles, which showed longer range than North Korea's previously known KN-01 anti-ship cruise missiles that can travel up to 160 kilometers (99 miles), were likely from a new cruise missile system North Korea displayed during a massive April 15 military parade.
The news agency said that North Korean leader Kim Jong Un witnessed the launches and that the missiles "accurately detected and hit" floating targets at sea.
"Looking at North Korean data and the US response to the launch, it appears to me that Pyongyang has indeed acquired re-entry technology".
The missile test was North Korea's fourth in a month and came after the U.N. Security Council imposed new sanctions on Kim's government last week.More news: Iraqi armed forces make progress in Mosul campaign
Meanwhile, today South Korea's military found a small flying object that it said was similar in shape and size to one of several North Korean drones discovered in 2014.
On Thursday, the North fired several short-range anti-ship cruise missiles from its east coast in defiance of worldwide sanctions.
The future of the program has been uncertain since South Korea announced the suspension.
North Korea confirmed on Friday that its Thursday missile launch was successful and was aimed at testing a new cruise anti-ship missile, the state KCNA news agency reported.
State Department spokeswoman Heather Nauert said during a press briefing that President Trump had discussed the Korean situation with the Defense Secretary and Secretary of State.More news: Warriors' Game 5 win wraps up highly-watched NBA Finals
On Wednesday, the presidential office announced deployment suspension of the new THAAD launchers, now stored at a United States army base, until the completion of environmental impact assessments, denying the reports the withdrawal of already deployed launchers, including two installed in Seongju [county in the north] during the election campaign.
Moon has sought to expand cross-border civilian exchanges as a way to improve ties, but North Korea on Monday rejected a Seoul civic group's offer to provide anti-malaria supplies to protest South Korea's support of fresh United Nations sanctions adopted last week.
Speaking at a doorstop interview, Japanese Foreign Minister Fumio Kishida condemned North Korea's latest missile launch.
"Our government, as I have already clarified multiple times, will not back off at all or compromise regarding national security and people's safety", Moon said.
Rand Corporation defense analyst Bruce Bennett told VOA that the missiles in Thursday's test were probably too small to be able to carry a nuclear warhead.More news: MMA star Matt Hughes injured after train collides with truck
The type of anti-ship cruise missile that North Korea tested on June 9 is created to fly at a low altitude, making it a potent weapon against ships.