BEIJING, Aug. 15 -- Japanese war criminal Kiichi Kobayashi ordered the killing of at least 29 Chinese, including soldiers and civilians captured by Japanese aggressors, according to his written confession published on Friday.

Kobayashi, who was convicted after the end of WWII, served as unit commander of the Mukden Military Police during the Japanese invasion of China.

According to his confession, he ordered his subordinates to kill nine Chinese who were held in Zhangjiakou No. 1 Prison by the Japanese army on September 3, 1937.

On September 15 of the same year, Kobayashi ordered the murder of a Chinese soldier, who was captured by the Japanese army, in a field two kilometers west of Datong.

According to his confession, available on the State Archives Administration (SAA) website, on August 11, 1945, Japanese aggressors killed imprisoned Chinese because "it is not appropriate to release these wartime enemies." Kobayashi did not specify the number of people murdered that day.

Meanwhile, the document revealed that the Japanese army used Chinese for medical experiments.

Kobayashi recalled that he ordered his subordinates to send a Chinese detainee to the military surgeon for an appendectomy experiment in November 1935. The person was later killed by Kobayashi's subordinates, along with another 3 Chinese, on the riverside one kilometer north of Chifeng.

In September 1936, Kobayashi's subordinates sent a Chinese by truck to the Manchurian Railway's Chifeng Hospital, where Japanese surgeons injected poison into him and dissected him after he was killed.

He also recalled that he sent "Soviet spies" to Ishii Unit in Harbin for bacteria testing in January 1944.

Additionally, Kobayashi's confession revealed the murder of 12 Chinese on a riverside to the north of Chifeng from July to October 1936 and another two Chinese on a grassland one kilometer east of Zhangjiakou on September 4, 1937.

The document is the latest of 45 Japanese war criminal confessions the SAA plans to publish. It has been issuing one per day since July 3.

The move follows denials of war crimes by Japanese Prime Minister Shinzo Abe and right-wing politicians.