U.S. spy agencies are seeing signs that North Korea is constructing new missiles at a factory that produced the country’s first intercontinental ballistic missiles capable of reaching the United States, according to officials familiar with the intelligence.

Newly obtained evidence, including satellite photos taken in recent weeks, indicates that work is underway on at least one and possibly two liquid-fueled ICBMs at a large research facility in Sanumdong, on the outskirts of Pyongyang, according to the officials, who spoke on the condition of anonymity to describe classified intelligence.

The findings are the latest to show ongoing activity inside North Korea’s nuclear and missile facilities at a time when the country’s leaders are engaged in arms talks with the United States. The new intelligence does not suggest an expansion of North Korea’s capabilities but shows that work on advanced weapons is continuing weeks after President Trump declared in a Twitter posting that Pyongyang was “no longer a Nuclear Threat.”

The reports about new missile construction come after recent revelations about a suspected uranium enrichment facility, called Kangson, that North Korea is operating in secret. Secretary of State Mike Pompeo acknowledged during Senate testimony last week that North Korean factories “continue to produce fissile material” used in making nuclear weapons. He declined to say whether Pyongyang is building new missiles.

During a summit with Trump in June, North Korean leader Kim Jong Un agreed to a vaguely worded pledge to “work toward” the “denuclearization” of the Korean Peninsula. But since then, North Korea has made few tangible moves signaling an intention to disarm.

Instead, senior North Korean officials have discussed their intention to deceive Washington about the number of nuclear warheads and missiles they have, as well as the types and numbers of facilities, and to rebuff international inspectors, according to intelligence gathered by U.S. agencies.

Their strategy includes potentially asserting that they have fully denuclearized by declaring and disposing of 20 warheads while retaining dozens more.

The Sanumdong factory has produced two of North Korea’s ICBMs, including the powerful Hwasong-15, the first with a proven range that could allow it to strike the U.S. East Coast.