Since 20:00 the day before yesterday, under the leadership of relevant person in charge of Public Security Ping An Sub-bureau, a large-scale "hazard removal action" to clean up small massage rooms has been carried out within the jurisdiction, including public security officers from the Public Security Department and various local police stations. Around midnight 0:30 yesterday, the command center received a report: sexual transactions were taking place inside an apartment in Building No.1, Chengji Center. Around 1:00 midnight, when the reporter arrived at the 21st floor of Building No.1, Chengji Center, many police officers had already lain in ambush around Room 2105. A police officer from the Stadium Police Station said that after receiving the report, they were divided into two groups. One group investigated and found that the door lock of this apartment was difficult to open from the outside. Another group of police officers learned from the property staff that this apartment often had different men and women coming and going, but they did not know who the owner was. In addition, they also learned that just half an hour ago, an unfamiliar elderly man in his 60s entered this apartment, but never came out.