Seoul, South Korea CNN —A US national is believed to be in North Korean custody after crossing the border during a tour, a United Nations agency said Tuesday. The individual was detained during a Joint Security Area tour after crossing the Military Demarcation Line separating North and South Korea, the United Nations Command said in a tweet. The prospect of a US national being held in North Korean military custody comes at a time of fraught diplomacy and rising military tensions on the Korean Peninsula. Under leader Kim Jong Un, North Korea has been ramping up tests of potentially nuclear capable intercontinental ballistic missiles, something South Korea and its treaty ally the United States are keen to push back on. The NCG is a joint US and South Korean panel set up by the countries’ leaders at a summit in Washington in April.

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Persons: “, Donald Trump, Kim Jong Un, Kurt Campbell, Joe Biden, Yoon Suk Yeol Organizations: South Korea CNN, United, Security, United Nations Command, U.S, National, Democratic People’s, UNC, Joint Security, North, CNN, Busan –, US National Security Council, Nuclear Consultative, South Korean Locations: Seoul, South Korea, North, United Nations, Democratic People’s Republic of Korea, DPRK, South, North Korea, United States, Busan, Washington, Pyongyang