After decades of denials, the Chinese have acknowledged burying an American prisoner of war in China, telling the U.S. that a teenage soldier captured in the Korean War died a week after he “became mentally ill,” according to documents provided to The Associated Press.

China had long insisted that all POW questions were answered at the conclusion of the war in 1953 and that no Americans were moved to Chinese territory from North Korea. The little-known case of Army Sgt. Richard G. Desautels, of Shoreham, Vt., opens another chapter in this story and raises the possibility that new details concerning the fate of other POWs may eventually surface.

Chinese authorities gave Pentagon officials intriguing new details about Desautels in a March 2003 meeting in Beijing, saying they had found “a complete record of 9-10 pages” in classified archives.

Until now, this information had been kept quiet; a Pentagon spokesman said it was intended only for Desautels’ family members. The details were provided to Desautels’ brother, Rolland, who passed them to a POW-MIA advocacy group, the National Alliance of Families, which gave them to AP this week.