South Korean Lee Keum-seom (L), 92, meets with her North Korean son Ri Sung Chol (R), 71, during a separated family reunion meeting at the Mount Kumgang resort on the North's southeastern coast on August 20, 2018. - Dozens of elderly and frail South Koreans met their Northern relatives on August 20 for the first time since the peninsula and their families were divided by war nearly seven decades ago. (Photo by KOREA POOL / KOREA POOL / AFP) / South Korea OUT / REPUBLIC OF KOREA OUT        (Photo credit should read KOREA POOL/AFP/Getty Images)
KOREA POOL/AFP/AFP/Getty Images
South Korean Lee Keum-seom (L), 92, meets with her North Korean son Ri Sung Chol (R), 71, during a separated family reunion meeting at the Mount Kumgang resort on the North's southeastern coast on August 20, 2018. - Dozens of elderly and frail South Koreans met their Northern relatives on August 20 for the first time since the peninsula and their families were divided by war nearly seven decades ago. (Photo by KOREA POOL / KOREA POOL / AFP) / South Korea OUT / REPUBLIC OF KOREA OUT (Photo credit should read KOREA POOL/AFP/Getty Images)
Now playing
02:02
S. Koreans cross DMZ for rare family reunions
Now playing
02:09
65 years waiting and hoping to see his sister again
Now playing
02:56
Mom to see son for first time in 68 years
Taehoon Lee
Now playing
01:41
Families separated by war hope to be reunited
korean reunion goodbyes novak cnni_00011302.jpg
korean reunion goodbyes novak cnni_00011302.jpg
Now playing
02:16
A North and South Korean reunion ends in goodbyes
pkg north korea south korea reunions hancocks_00002119.jpg
pkg north korea south korea reunions hancocks_00002119.jpg
Now playing
01:41
Families reunited after decades apart
PANMUNJOM, SOUTH KOREA - JANUARY 09:  South Korean Unification Minister Cho Myoung-gyon (L) shakes hands with the head of North Korean delegation Ri Son-Gwon (R) before their meeting at the Panmunjom in the Demilitarized Zone on January 9, 2018 in Panmunjom, South Korea. South and North Korea are scheduled to begin their first official face-to-face talks in two years on Tuesday, January 9, 2017.  (Photo by Korea Pool/Getty Images)
Pool/Getty Images AsiaPac/Getty Images
PANMUNJOM, SOUTH KOREA - JANUARY 09: South Korean Unification Minister Cho Myoung-gyon (L) shakes hands with the head of North Korean delegation Ri Son-Gwon (R) before their meeting at the Panmunjom in the Demilitarized Zone on January 9, 2018 in Panmunjom, South Korea. South and North Korea are scheduled to begin their first official face-to-face talks in two years on Tuesday, January 9, 2017. (Photo by Korea Pool/Getty Images)
Now playing
01:55
Korea talks focus on Olympics, family reunions
korea family reunions hancocks pkg_00000808.jpg
korea family reunions hancocks pkg_00000808.jpg
Now playing
01:45
Korean man's 60-year wait to see family
(CNN) —  

The United Nations nuclear watchdog agency says it has “grave concern” that North Korea continues to develop its nuclear weapons program.

A report Monday from the International Atomic Energy Agency noted that without direct access to North Korean weapons sites its information is limited, though it is monitoring the program through “more frequent collection of satellite imagery.”

The report includes a detailed list of nuclear-related activities the agency believes have been underway in recent months mainly at the Yongbyon Nuclear Scientific Research Center, one of the country’s major nuclear sites.

The IAEA report provides some of the most specific information made public so far about North Korea’s activities. They include:

  • Indications consistent with the use of centrifuge enrichment technology at the nuclear fuel-rod fabrication plant including operation of cooling units and movement of vehicles.
  • Indications “consistent” with operation of the 5-megawatt experimental nuclear power plant including discharges of steam and cooling water.
  • Operations of a steam plant were observed that served a radiochemical laboratory associated with nuclear fuel processing.
  • There are also indications of ongoing mining, milling and other fuel activities at a site previously declared as a uranium mine and an associated plant.

Secretary of State Mike Pompeo told the Senate Foreign Relations Committee in July that the regime is still making fissile material, but he gave no other details.

Pompeo has subsequently said the US still has a long way to go in discussions with North Korea to achieve the full denuclearization the Trump administration says North Korean leader Kim Jong Un promised.

On Monday US President Donald Trump said another summit with Kim would “most likely” happen but offered no details on timing or venue in an interview with Reuters.

In the interview, Trump pointed to an absence of missile or nuclear tests from Pyongyang as a measure of the success he’s had in dealing with the reclusive regime, which last year was threatening the US mainland with nuclear strikes.

“I stopped (North Korea’s) nuclear testing. I stopped (North Korea’s) missile testing. Japan is thrilled. What’s going to happen? Who knows? We’re going to see,” the President said.

CNN’s Jamie Tarabay contributed to this report.