North Korea acknowledged it has detained an American for illegally entering the reclusive country, news welcomed by relatives of an Arizona missionary who feared they would never hear from him again after he sneaked across the border.

Activists say they last saw Robert Park as he slipped across the frozen Tumen River into North Korea on Christmas Day, carrying letters urging the country's absolute leader to step down and free the hundreds of thousands of people held in political camps.

After four days without any word, relatives of the 28-year-old Korean-American said Tuesday they were relieved when the communist country finally announced it had a U.S. citizen in custody _ though analysts say Park's actions are likely to be seen as hostile to the regime and could draw a long prison sentence.

"My fear was that they say they don't know anything about it and may get rid of him secretly," Manchul Cho, an uncle of Park, told The Associated Press in California. "Once they recognize it, that's really good."

The two-sentence dispatch from the official Korean Central News Agency said an American was being investigated after "illegally entering" the country on Christmas Eve.

In Washington, U.S. State Department spokesman Ian Kelly said that North Korea had "confirmed it is holding a U.S. citizen pending an investigation," and that the U.S., which does not have diplomatic ties with Pyongyang, would seek consular access to the citizen through the Swedish Embassy.

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Monks, tourists, villagers mark Asian tsunami

PHUKET, Thailand (AP) _ Buddhist monks in orange robes chanted on a Thai beach, an Indonesian mother mourned her children at a mass grave, and a man scattered flowers in now-placid waters to commemorate the 230,000 killed five years ago when a tsunami ripped across Asia.

An outpouring of aid that followed the Dec. 26, 2004, tsunami has helped replace homes, schools and entire coastal communities decimated by the disaster. But at Saturday's ceremonies, survivors spoke of the enduring wounds.

Thousands in Indonesia's Aceh province, which was hardest hit, held prayer services at mosques and beside the mass graves where tens of thousands were buried. The 167,000 people who died in Indonesia accounted for more than half the total death toll.

On Saturday's anniversary, Indonesian villagers briefly panicked when another strong earthquake struck deep under the sea off the eastern coast, officials said. Residents in Saumlaki, about 1,680 miles (2,700 kilometers) east of the capital Jakarta, said the magnitude-6.0 quake cut electricity, but there were no reports of damage or injuries.