"But we'll see what happens". "We'll see", he said.
The photos by the firm DigitalGlobe show the presence of cars and trucks at the site on February 22, said NPR - which has exclusive access to the imagery.
But I can't unfortunately use X-ray vision to see what's on the train and tell whether it's a civilian space launch vehicle or a military ICBM, ' North Korea expert Melissa Hanham said. "It could either be preparation for an eventual launch or not". The White House said that nothing has authoritatively been planned or dropped.
South Korea and the United States signed a deal on Friday that would increase Seoul's financial contribution for the deployment of US troops in the Asian country.
The Vietnam summit on February 27-28 collapsed over differences about how far North Korea was willing to limit its nuclear programme and the degree of U.S. willingness to ease economic sanctions.
Analysts believe that it is more likely that Pyongyang is preparing to launch a satellite rather than test a missile.
A senior U.S. State Department official said on Thursday that any launch from there would be "inconsistent" with North Korean commitments.
FILE - North Korean leader Kim Jong Un gestures as he and U.S. President Donald Trump sit down before their one-on-one chat during the second U.S.
"President Trump never codified in writing North Korea's missile and nuclear testing freeze", Markey said.
"Our map data shows the locations of mines across North Korea, and we also detected soundwaves, proving that this quake was caused by an explosion", he said.
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Its state television aired a 78-minute documentary late on Wednesday showing a cordial mood between Trump and Kim as the Hanoi summit ended, indicating Pyongyang was not about to walk away from negotiations, experts say.
Trump described how he would be "very disappointed" if North Korea were planning to resume weapons testing.
Suh Hoon, the director of South Korea's National Intelligence Service, told his nation's lawmakers in Seoul that North Korea was restoring facilities at a rocket launch site it had dismantled past year in a goodwill measure.
However, two days on from the stalemate in Hanoi, Satellite images captured on March 2 show operations at the once-dormant Sohae site have resumed full-throttle - with its facilities once again under construction.
Kim released his first public message since the Hanoi summit on Saturday, March 9 earlier this week, instructing propaganda officials to conduct "positive information" activities to spur scientific and technological development, according to a Saturday report by North Korean state media outlet KCNA.
"The public at home and overseas that had hoped for success and good results from the second DPRK-U.S. summit in Hanoi are feeling regretful, blaming the U.S. for the summit that ended without an agreement", KCNA reported, citing a commentary in the Rodong Sinmun newspaper.
The paper directed fiery rhetoric against Japan, accusing it of being "desperate to interrupt" relations between Pyongyang and Washington and "applauding" the breakdown of the summit.
Suh also said that the rebuilding was being done in such a way that the site could be blown up in a more dramatic fashion when US inspectors visit in the event of the negotiations with the Trump administration going well in the future. From now on, North Korea's denuclearization must be addressed exclusively based on these facts.
"We need the North Korean negotiators to have much more latitude than they did in the run-up to the summit on denuclearisation, but I am confident that if they get that direction from the top of the North Korean government, we can make quick progress with them", he said. "Both sides are going to have to digest the outcome to the summit".
What we learned from this was that the North Korean nuclear issue is thorny, with no straightforward solutions.