Following the forensic examination, Du Dayong and the others also began to prepare for pumping the septic tank.
Zhang He informed the residents of this building to close the doors and windows and not to use water for the time being.
Du Dayong and the others also started working.
Just an hour after the whole work started, news came from the forensic department, but it was not bad news. No trace of human blood was found in the whole house.
Now we have to focus on the septic tank, and the local police station has also been vigilant around it.
The work continued until around 1:10 in the middle of the night. Finally, two broken SIM cards were found in the evacuated feces. The SIM cards that had been washed with water were spliced together and it was determined that they were the SIM cards that had just been broken.
Although he spent nearly two thousand yuan, Du Dayong didn't care about the money at this time, because Du Dayong believed that these two broken SIM cards would definitely bring him new clues.
After the work was over, together with three more criminal policemen sent by the Huxi Branch, the ten criminal policemen already smelled terrible.
Du Dayong had no choice but to ask everyone to take a bath and have a midnight snack.
By the time everything calmed down, it was already four o'clock in the morning when Du Da used them to rest.
The five people only slept for three and a half hours before starting a new day of work.
At 8:30, with the cooperation of the Huxi Branch, the two cards were found to belong to and where they were sold based on the numbers on the backs of the cards.
One card is an unnamed China Unicom phone card purchased at the Qingnian Road Unicom business hall. The other is an bearer phone card purchased at a mobile phone business hall in Weicheng.
Immediately, Du Dayong reported the number of the phone card purchased in Weishi to several people staying at home, and several people at home also sent Xie Hui and Zhang Zongping to quickly rush to the Weishi Municipal Bureau.
By retrieving the call records of this China Unicom card, Du Dayong and the others quickly locked a number, which was a mobile number that was located in Weihai.
This discovery made Du Dayong and the others immediately excited. As for the fact that they only slept for three and a half hours yesterday, it didn't matter.
Since there were very few contact numbers in Tianjin on the call records, Du Dayong decided to divide the people he brought over into two groups.
One group continued to look for the Jin City number in the call records here, while the other group rushed to Shuangxi City.
Because the phone number of Shuangxi City, which I contacted frequently, also appeared on this call record.
But now it was obvious that there was not enough manpower. If there was any difficulty in finding the boss, Du Dayong immediately called Li Congshan.
Li Congshan received Du Dayong's call and immediately assigned the Second Squadron and the Third Squadron to conduct a comprehensive investigation based on the location of the call record number provided by Du Dayong.
At night, Du Dayong finally determined who the owner of the number was through tracking the Jin city number and comparing calls.
Zhang Li! is now 52 years old. He was sentenced to seven years in prison for abducting women and children and was released in 2000. He lives in House 201, Building 3, Erhua Factory Dormitory, Chunhua Street, Hudong District.
That night, Du Dayong and the criminal police sent by the Hudong Branch conducted surveillance here.
When the surveillance began, the Hudong Branch sent investigators disguised as heating pipe managers to make tentative contacts at Zhang Li's residence.
But Zhang Li is not at home. According to visits to his neighbors, Zhang Zhang has not been back for a long time.
After hearing the report of the situation, the Hudong Branch immediately contacted the local neighborhood committee and asked the comrades from the neighborhood committee to call Zhang Li's phone number and said that the heating pipe in his home was leaking and asked him to come back and deal with it.
After Zhang Li answered the phone, he told the people in the neighborhood committee that he would not be able to go back until noon tomorrow.
But Du Dayong would definitely not believe this trick.
Du Dayong felt that people like this would generally be wary of such calls, especially after Wen Xinglian escaped, and would definitely find a way to ensure their own safety before coming back.
So Du Dayong immediately discussed with the criminal police from the Hudong Branch and found an unlocker to enter Zhang Li's house first and destroy the heating pipes in Zhang Zhang's house. Then whether Zhang Zhang sent someone back or Zhang Li came back in person, at least it was certain that
, it is indeed the heating pipe that is broken.
After discussing here, the criminal police from Hudong Branch immediately followed Du Dayong's idea. It only took more than half an hour to get it done. In order to avoid leaving traces of entry, Du Dayong also asked Luo Xin
I went to another house to sweep some dust and sprinkle it again.