Wang, a 53-year-old policewoman from Shangqiu city, went to Zhengzhou to visit her daughter and on Monday night when a group of police officers raided their apartment.
A video-tape provided by an unnamed source showed seven to eight men barged into their apartment midnight. Wang was punched in the face by one man in the video the moment she opened the door.
Wang told them that they were making a mistake and showed her police ID, but the men didn't believe it and took her and her daughter downstairs, a report by Hennan Daily said.
During the detention no one talked to them, and they were also not allowed to speak. A policeman later told them a mistake had been made and they could leave.
More From This Section
Wang was quoted as saying only one policeman wore a uniform and the group had refused to show their police IDs when asked.
Wang's daughter told the newspaper that the Zhengzhou police had already apologised for the incident.
The newspaper said Zhengzhou police refused to give any details.