South Korean media on Thursday said that new activity has been detected at a North Korean long-range missile facility, Reuters reported.

Two South Korean newspapers, citing lawmakers briefed by the nation’s spy agency, reported movement around a factory on the outskirts of Pyongyang, according to Reuters.

That factory is the same one that produced the first North Korean intercontinental ballistic missiles that could reach the U.S., the news service noted.

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The Associated Press, meanwhile, reported Thursday that South Korea’s military said it is monitoring nuclear and missile facilities in the north after the lawmakers’ briefing.

A lawmaker who asked not to be identified told the AP they were told that vehicles were transporting supplies at the missile factory, but specifics were not provided.

President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Wednesday said he would be “very disappointed” if reports earlier in the week that North Korea had begun rebuilding a missile launch facility near the Chinese border prove to be true.

Trump did not confirm or deny the reports but suggested that the development could throw another wrench in his effort to strike a nuclear agreement with North Korean leader Kim Jong Un.

“I would be very, very disappointed in Chairman Kim,” the president told reporters at the White House. “I don’t think I will be, but we’ll see what happens.”

Trump also expressed confidence that he would eventually reach a deal with Kim, despite the failure of their nuclear summit in Vietnam last week and the subsequent reports on missile activity.

“We’ll take a look. It will ultimately get solved,” he said.

--Jordan Fabian contributed to this report.