BEIJING (AP) _ A Chinese villager unhappy with the results of an eye operation set off explosives in the hospital that treated him, killing himself and four others and injuring 35 others, the official Xinhua News Agency said Wednesday.

The doctor who diagnosed Bao Jihou as having a detached retina was among those killed in the Nov. 14 blast in the eye care department of the No. 3 People's Hospital in the southwestern city of Chongqing, Xinhua said.

Bao, 55, argued with the doctor, Li Mingsu, after the operation and vowed to seek revenge, Xinhua said. In a letter Bao left his family, he said he planned to file suit against Li ``in the nether world,'' the report said.