There was no direct word from 85-year-old Merrill Newman, and his alleged apology, which was dated Nov. 9, couldn't be independently confirmed. Pyongyang has been accused of previously coercing statements from detainees.
North Korean authorities released video showing Newman reading the apology.
The statement, carried in the North's official Korean Central News Agency, said the war veteran allegedly attempted to meet with any surviving soldiers he had trained during the Korean War to fight North Korea, and that he admitted to killing civilians and brought an e-book criticizing North Korea.
It wasn't clear what would happen to Newman now. But the statement alleges that Newman says if he goes back to the U.S. he will tell the truth about the country -- a possible indication that Newman could be released.
The apology can be seen as Pyongyang taking steps needed to release Newman, said Yoo Ho-Yeol, a professor of North Korea studies at Korea University in Seoul. North Korea likely issued the confession in the form of an apology to resolve Newman's case quickly without starting legal proceedings, Yoo said.
North Korea is extremely sensitive about any criticism and regularly accuses Washington and Seoul of seeking to overthrow its authoritarian system through various means -- claims the U.S. and South Korea dismiss. The State Department has repeatedly warned
Americans about traveling to the country, citing the risk of arbitrary detention.
Newman, an avid traveler and retired finance executive, was taken off a plane Oct. 26 by North Korean authorities while preparing to leave the country after a 10-day tour. His traveling companion seated next to him, neighbor and former Stanford University professor Bob Hamrdla, was allowed to depart.
Newman's son, Jeffrey Newman, said his father wanted to return to the country where he spent three years during the Korean War.
North Korea has detained at least six Americans since 2009, including two journalists accused of trespassing and several Americans, some of whom are of Korean ancestry, accused of spreading Christianity. Kenneth Bae, a Korean-American missionary and tour operator, has been detained for more than a year. North Korea sees missionary work as a Western threat to its authoritarian government.