Choe also said Kim Jong Un expressed "heartbreak" upon the death of Kim Chol Man, and that the North Korean leader gave orders to build a bust of the deceased official.
Yeongjeo-dong has always been known to U.S. intelligence agencies but researchers at the Middlebury Institute of International Studies at Monterey told CNN that the construction on a new facility, at Hoejung-ri, seven miles away, had not previously been publicly identified.
"Moreover, in the past year North Korea has significantly expanded a nearby facility that appears to be another missile base".
There was no immediate reaction from the Trump administration Thursday to the reports that raised concern in national security circles about the pace of denuclearization talks between Washington and Pyongyang.
The group at Middlebury Institute of International Studies said based on its unique location, Yeongjeo-dong has always been a strong candidate to receive North Korea's newest long-range missiles. His administration has also repeatedly claimed progress in talks with North Korea, citing the lack of nuclear and ballistic missile tests since the country launched its Hwasong-15 intercontinental ballistic missile in November of a year ago.
The developments come against a backdrop in which Mr. Trump and his advisers say they are hoping for a second summit with Mr. Kim to discuss progress - or the lack thereof - toward denuclearization.
"Those missiles are being deployed at bases throughout North Korea, many of which have always been known to outside analysts", the report stated.
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"They have not lived up to the commitments so far", Bolton said at The Wall Street Journal's annual CEO Council conference in Washington.
Researchers were able to locate five entrances to underground tunnels they said may be used to store missiles.
Satellite images have picked up activity at a North Korean missile base.
"Those missiles are being deployed at bases throughout North Korea, many of which have always been known to outside analysts".
Despite the deadlock, Trump has said he and Kim are "getting along very well" and have a "good relationship".
"North Korea and the United States appear to be making headway", a high-ranking South Korean government source told the Hankyoreh paper.
In October, Secretary of State Mike Pompeo met Kim Jong-Un in Pyongyang to verify that the Punggye-ri nuclear test site had been "irreversibly dismantled". "These shelters are similar to the ones seen at the older portion of the Yeongjeo-dong base".