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North Korea has “significantly expanded” a long-range missile base and started construction on a new facility even after President Kim Jong Un met with President Donald Trump in Singapore over the summer, experts said Wednesday, citing new satellite images. The images, released to CNN by researchers at the Middlebury Institute of International Studies, reportedly show that the Yeongjeo-dong missile base and another previously unreported site “remain active and have been continuously upgraded.” In the past year, North Korea has “significantly expanded a nearby facility that appears to be another missile base,” the report from Middlebury Institute stated. Construction on the new facility appears to have occurred during the Singapore Summit between Kim and Trump, according to the report, which estimates that the “underground facility” started development in 2017 and was still under construction as of August 2018. The Singapore Summit ended with the two nations agreeing that North Korea will “work toward complete denuclearization of the Korean Peninsula,” but no firm commitments were made.