A 29-year-old American Christian, claiming God showed him a vision of North Korea's liberation and redemption, has entered the communist country to urge leader Kim Jong-il to repent, AFP reported Saturday quoting activists.

Robert Park, a U.S. citizen of Korean ancestry, crossed the frozen Tumen River from China and walked into the North without permission on Christmas Day, they said.

"While crossing the frozen river in a snowstorm, Park shouted loud, saying 'I'm a U.S. citizen, I came here to proclaim God's love,'" a colleague of Park's told AFP.

"But all were silent on the other side of the river. We assume he was arrested by North Korean border guards there. But we don't know about his fate," he said on condition of anonymity.

Park, a self-proclaimed seer and activist, is a leader of an international campaign for North Korean human rights called "Freedom and Life for All North Koreans: 2009," his colleague said.

The group describes itself as a worldwide coalition of Christian ministries and activists working to promote human rights in the North.

Park reportedly carried a letter addressed to Kim and other leaders calling on them to repent.

"I proclaim Christ's love and forgiveness toward you today. God promises mercy and clemency for those who repent," Park said in the letter, which was made public Saturday.

"He loves you and wants to save you and all of North Korea today," he said.

U.S. embassy officials said they had no information on the reported incident.