AI is concerned about the fate of Shibata Kozo, a prisoner whose case the organization described in its October 1993 report "North Korea: Summary of Amnesty International's concerns" (ASA 24/03/93). In a letter to AI of 9 June 1994, the North Korean government said that Shibata Kozo and his entire family had been killed in a rail accident in March 1990. However, this appears to be inconsistent with AI's own information that he was in custody at this time. AI is calling on the North Korean Government to provide documentary evidence of the alleged deaths.