Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. American Activist Enters North Korea Human rights activists say Robert Park crossed into N. Korea Friday to urge leader Kim Jong Il to repent VOA News 26 December 2009 A South Korean woman watches TV broadcasting of Christian missionary Robert Park, 26 Dec 2009 Photo: AP A South Korean woman watches TV broadcasting of Christian missionary Robert Park, 26 Dec 2009 Human rights activists say an American Christian missionary crossed into North Korea Friday to urge leader Kim Jong Il to repent. The activists said Saturday that Robert Park crossed into North Korea from China Friday, carrying a letter urging the North Korean leader to release political prisoners, shut down the concentration camps where they are held, and open the borders to allow aid teams to enter. South Korea and Western governments say North Korea maintains a network of political prisons holding tens of thousands of prisoners. Pyongyang denies the charges. A colleague said Park, a Korean-American, is a member of an international campaign called "Freedom and Life for All North Koreans." There has been no response from the North about the crossing. American journalists Euna Lee and Laura Ling, of the U.S. media outlet Current TV, were arrested in March after accidentally crossing into the North while working on a story. They were sentenced to 12 years of hard labor, but were freed as part of a diplomatic mission led by former U.S. President Bill Clinton in August. Some information for this report was provided by AFP, AP and Reuters. .