SEOUL, South Korea — North Korea said on Friday that it has detained an American citizen who visited the country as a tourist, and that it was investigating him on charges of violating its laws.

The man, Jeffrey Edward Fowle, entered North Korea on April 29 and “perpetrated activities that violated the laws of our republic, which did not fit his stated purpose of visiting our republic as a tourist,” the North’s official Korean Central News Agency said. “Our related agency has detained him and is investigating him.”

The news agency gave no further details about Mr. Fowle, like where in the United States he came from.

The U.S. had already advised that no Americans should travel to the North, following the arrest last year of an 85-year-old American tourist, Merrill E. Newman of Palo Alto, Calif. Mr. Newman was released after more than a month of captivity. The North had accused him of war crimes after learning that Mr. Newman, a Korean War veteran, had helped train anti-Communist guerrillas during the war. But it cited Mr. Newman’s age, 85 at the time, as a reason for releasing him.

But North Korea is still holding at least two other American citizens.

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