A police raid on a pyramid-selling gang went wrong in Sichuan when suspects trapped two officers in a room and apparently stabbed them repeatedly, state media quoted witnesses as saying.
A third officer was also injured, although the details were not disclosed.
The incident occurred in Guangyuan , about 300km northeast of the provincial capital, Chengdu , on Friday, the municipal public security bureau said on its website.
Police sent three officers after receiving tip-offs that a pyramid-selling group was holding an event in a residential area in the Lizhou district.
When they arrived, people led two of the officers to a room on the fourth floor. As they entered, the door was immediately locked behind them, the People's Daily website People.com.cn  quoted witnesses as saying.
The third officer heard cries from his colleagues that sounded like they were being attacked, the report said. He fired six shots in the air, but the assault continued until more officers arrived at the scene.
Witnesses said they saw the two policemen being carried from the room and their uniforms were bloodied. It appeared that they had been stabbed with knives.
The bureau said the policemen were mobbed by members of the pyramid-selling group and their batons and guns were taken from them.
Fifteen suspects were detained, Xinhua reported.