A former prison that held Japanese war criminals after World War II in Fushun City of northeast China's Liaoning Province, reopened its doors to the public Monday after two years of renovations. More than 800 photos, 500 relics and video clips depicting the history of the prison and the life of its inmates are displayed in a 2,000-square-meter newly built exhibition hall at Fushun War Criminal Prison, said Zhang Jicheng, head of the prison. The renovations cost 30.3 million yuan (4.4 million U.S. dollars), he said. Opened in 1950, the prison housed and reformed 969 Japanese war criminals who participated in the invasion of China. They had been released to Japan as of 1964. On Sunday, former inmates of the prison Sakakura Kiyosi and Takahashi Tetsuro visited the prison and showed much regrets about the crimes they committed. Nearly 300 former inmates have returned to visit the former prison, Zhang said. Many of the inmates were dedicated to the Sino-Japanese friendship in Japan, he added. 