The government-run Korean Central News Agency (KCNA) said the citizen was detained October 16 for illegally entering the country, and that the American said he "was under the direction of the Central Intelligence Agency", the South China Morning Post reported.
"North Korea is saying 'If you don't listen to us, you will face political burdens, '" said analyst Shin Beomchul of Seoul's Asan Institute for Policy Studies.
Media reports said that Bryon told South Korean officials he sought to facilitate talks between North Korea and the United States, although he is a private citizen.
The US citizen, identified as Bruce Byron Lowrance, has been detained in North Korea since he was caught illegally entering North Korea via the border with China last month, according to the Korean Central News Agency.
Last year, USA media said the man expelled from South Korea - who has also been named as Lawrence Bruce Byron - had claimed he wanted to help resolve tensions between North Korea and the US. In September, North Korean leader Kim Jong-un met with South Korean President Moon Jae-in, and they agreed to close a key DPRK missile testing site, initiating what Moon described as "the era of no war".
Experts say the weapon test was likely an expression of anger by North Korea at US -led worldwide sanctions and ongoing small-scale military drills between South Korea and the United States.
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Kim Jong Un's weapons - back in the spotlight Friday (November 16).
Moon invited Xi to visit South Korea as part of the improving situation on the Korean Peninsula, and Xi replied that he is prepared to do so next near if circumstances allow. Backed by the recent development in its relations with China, North Korea is expected to aggressively pursue the development of the city, analysts say.
Little is known about the weapon that was tested, but it did not appear to be the type of long-range missiles frequently fired past year because South Korea and the United States didn't report detecting any such activity. It's the first mention of a new development in its weapons program in months. However, for North Korea, who are still much smaller in relation to the United States, they view their weaponry as a form of securing their region and not to start a global war. "We made great progress but there's more work to be done", he said.
It said the test was successful but did not specify the type of device involved.
It marked the first official report of a weapons test by North Korea since it began the delicate diplomatic process with Washington.
From journalists to missionaries, most Americans held by North Korea have been released after high-profile interventions. Yang Wook, a Seoul-based military expert, said a "tactical weapon" in North Korea refers to "a weapon aimed at striking South Korea including US military bases" there, so the North may have tested a short-range missile or a multiple rocket launch system.