North Korea has expanded a long-range missile base in the country's interior and appears to be building a new one, according to a report.
Satellite images viewed by CNN showed that the Yeongjeo-dong missile base and a nearby, previously unreported site were not only active but were being upgraded.
Read more: Trump thanks North Korea's Kim Jong Un for his "nice letter"
Denuclearizing the Korean Peninsula was the focus of the summit in Singapore last June between leader Kim Jong Un and President Donald Trump.
But a report by the Middlebury Institute of International Studies at Monterey said there had been construction on a new facility 7 miles away from the older Yeongjeo-dong site that had not been previously publicly identified.
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