Zhu Jie, the head of the technical department, immediately arranged for his staff to trace the source of the call. The results showed that it was a 2G number from China United Corporation. There was no user name recorded, and it was turned off. The last location of the network could be found, but since Qin Jiangqiao's daughter said that she was in the car, the other party must have left. Qin Jiangqiao had no choice but to arrange for people to monitor his phone and wait for the next contact.
At around 11 pm, another unknown number called Qin Jiangqiao's work phone. It was the same person. "Director Qin, you don't seem to understand what I'm saying. I know you haven't called off the operation yet.”
"What do I have to do to make you believe me?"
"Send out a notice for the holidays. Tell the people in charge of drug enforcement and the armed police to go home. As long as you do it, I'll have a way to know. I promise to let your daughter go after tonight." After saying that, the other party hung up the phone decisively. The call lasted only nine seconds. Li Shilei, the technician in charge of the surveillance, reported that the criminal had changed to another 2G number of China United Corporation that did not register the owner's information. After the call ended, he immediately turned off the phone, so there was no way to track him.
Under such circumstances, the captain of the Criminal Investigation Team One, Zhang Zhaohui, took the initiative to go to the company to see if he could find any clues through the system there. Qin Jiangqiao had requested that he not delay the operation at night, and only agreed to let him go after getting Zhang Zhaohui's assurance.
Not long after Zhang Zhaohui left, the security chief, Wang Hemin, rushed back to the Public Security Department from the sanatorium to personally inquire about the kidnapping case. Lu Tao and Bi Guangqing, the other two deputy directors of the Public Security Bureau, came with him. Qin Jiangqiao expressed his gratitude to the leader for his concern, but he insisted that the overall situation was the most important thing. The 501 anti-crime operation could not be canceled. Wang Hemin saw his firm attitude and comforted him a little more. Then, he panted and sat down to rest.
All the leaders of the Provincial Public Security Department knew that Director Wang Hemin was old and his health had not been good. He had spent more time in the sanatorium than in the office in the past two years and no longer exercised his decision-making power. Qin Jiangqiao was currently in charge of the Jiangbei Provincial Public Security Bureau. There was already news that the Provincial Party Committee had decided to let Wang Hemin retire to the Provincial People's Congress, and Qin Jiangqiao was at the top of the list of candidates for the position of the next director. With such a background, the success or failure of 501's anti-crime operation was crucial to Qin Jiangqiao's personal career. It was no wonder that he was so decisive even when his daughter was kidnapped.
"I've already drafted the document. If you really understand the situation in the provincial office, you should know that this requires Director Wang Hemin to personally sign and approve. Chief Wang was rushing over. I will convince him."
Qin Jiangqiao glanced at Wang Hemin who was sitting beside him. Wang Hemin knew that this was a delaying tactic and nodded in response.
"I want to add another request. Prepare 5 million. I'll tell you where to send it tomorrow."
"I'll be ready in an hour. How was the trade today?"
"Your daughter is so beautiful. I can't bear to tell you that feeling tomorrow.”
Qin Jiangqiao threw his phone to the ground in embarrassment. Wang Hemin stood up and wanted to persuade him, but when he saw his fierce gaze, he didn't know what to say.
At this moment, the recorder, Wang Xin, picked up a phone call and asked,""Zhou Hao called to ask what number the robber used.”
“130xxxx3!”Li Shilei, the technician in charge of monitoring, replied.
"It really is this number!" Wang Xin seemed very excited. She spoke a few more words to the other end of the phone before reporting to the two leaders loudly,"Director Wang, Director Qin, Zhou Hao said that the technicians at China Unicom have already traced this phone.”
Li Shilei almost jumped up. "How did you catch up? Didn't you turn off your phone?”
"They said that the robbers switched their phones on after switching them off. They didn't change their phones.”
"Good!" Wang Hemin shouted, looking even happier than Qin Jiangqiao. He asked for Wang Xin's phone number." Hello? This is Wang Hemin. Let Zhang Zhaohui answer the phone. Hello? Zhaohui, hurry up and save Jiang Qiao's daughter! Alright, just tell me what you need to transfer.”
Turning around, Wang Hemin comforted Qin Jiangqiao." Don't worry, there's a way to track him down."”
Qin Jiangqiao nodded." I'll contact the SWAT." Tell them to get ready."
Xu Musheng accurately reported the number used by the robber for the third time, completely dispelling Zhang Zhaohui's concerns. "The robbers just called. It's the account you mentioned. Hurry up and locate it."
"Not yet. My robber just turned off his phone again. I still have to wait.”Xu Musheng made himself a big cup of coffee unhurriedly and went back to the computer to refresh the background data a few times. About two minutes later, the system showed that the phone used by the robber was connected to the network again. As expected, it changed to the fourth number.
"Okay, I found a new number. I'll go to the monitoring hall. They could pull out the distribution map of the base stations in the province, making it easier to track and locate them.”As he spoke, he took out a laptop from the cabinet next to him, which he used to enter the computer room to test the equipment. He held it under his arm and didn't forget to bring his coffee cup with his other hand. "But I have to make it clear that we are using LBS-based positioning, which is to use the signals between the mobile phone and different base stations to triangulate the location. The accuracy of this positioning method was relatively rough. According to the density of the base station, the error was about 20 to 50 meters. The trajectory of the robbers that we see later is still different from the real trajectory. What do you plan to do?"
This was indeed a problem that gave Zhang Zhaohui a headache. A precision error of 20 to 50 meters meant that it was impossible to accurately determine which car was the robber's car on the road. At most, they would know where the robbers had passed and which area they were in. This was still far from the conditions to rescue the hostages.
Xu Musheng almost rolled his eyes. "How can you have such amazing skills? It's not like you're acting in a movie. Actually, I just checked the model of the robbers.”At this point, he couldn't help but laugh." A noika 3210, a machine from the last century. The kind with a blue screen, forget about the GPS. Sometimes, it was safer to have fewer irrelevant functions.”
The monitoring hall was on the second floor of the same building. It was bigger than a basketball court. The entire wall in front of the hall was a large LCD monitor that displayed the backbone network of the province, the base station occupation rate, user calls, and real-time reports of wireless Internet access.
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