A Chinese villager armed with a double-barreled hunting gun killed four people, including two police, in northern Hebei province on Tuesday, local media said.
The development is a rare outbreak of gun violence in a country where firearms are tightly controlled.
Liu then shot dead two police officers and wounded two, the report said
Liu was trapped in his house and found dead when police broke in around dawn, it said, adding the cause of his death was not yet known.
State television had said Liu had been shot.
Media carried pictures of a news release from the government which said the 55 year-old Liu was bipolar.
Gun violence is unusual in China as private gun ownership is restricted.
In December, an employee of China’s central bank shot and killed two colleagues at the branch he was working at in the northeastern province of Liaoning.