Wang Shuai nodded while listening: "Old Yang, you are experienced, and the traces of the scene depend on you. Pay more attention to the details and see if you can find more clues to the suspect."
While continuing the investigation, Wang Shuai found several blurry footprints on the window sill. The footprints were small and did not look like they were left by adults, and the footprints were directed from outside the window toward the house.
"Please be careful, don't destroy this footprint." Wang Shuai quickly reminded the team members, and then called Yang Sen, "Yang Sen, please check this footprint. Can you extract useful information?"
Yang Sen skillfully took out the tools and began to extract the footprints plaster model: "The footprints are a bit vague, but fortunately the pattern can be identified. After the model is made, it is analyzed and analyzed and analyzed. Some characteristics of the footprints may be inferred. From the preliminary observation, the focus point and stride of the footprints are very special, and a lot of things should be analyzed."
At the same time, in the corner of the house, team member Xiao Zhang found a metal container that was burned and deformed, and the lid of the container was gone.
"Team Leader Wang, look at this." Xiao Zhang walked over with a metal container.
Wang Shuai took the container and carefully observed the material and shape of the container. Judging from the residual part of the container, this is likely to be a small gasoline barrel, further confirming his speculation about arson.
"Take this back and let the technicians check carefully to see if they can find fingerprints or other clues related to the suspect." Wang Shuai handed the container to Xiao Zhang.
On the other hand, the visiting team led by Zhang Hui also gained something. A neighbor who lives opposite recalled that about half an hour before the fire, he saw a tiny man wearing a hat and mask and carrying a backpack, staying at the victim's doorstep for a while before hurriedly leaving.
"Can you describe the person's appearance carefully? For example, height, clothing, etc." Zhang Hui asked patiently.
The neighbor frowned and thought, "He was about 1.65 meters tall, wearing a black hooded sweatshirt, his pants seemed to be dark jeans, and he was carrying a black backpack. He didn't pay much attention to the others. He thought it was a bit strange at the time, but he didn't care too much."
Zhang Hui recorded the information in detail: "Okay, thank you. If you think of anything else, feel free to contact us."
After returning to the Criminal Investigation Detachment, Lu Chuan organized a case analysis meeting. Everyone sat together, and the atmosphere was solemn. Yang Sen first reported on the on-site investigation: "From the traces at the scene, there were signs of prying the door lock, flammable liquid suspected of gasoline was found near the sofa in the living room, suspicious footprints were found on the windowsill, and a metal container suspected of gasoline barrels was found. Based on these clues, the fire was very likely a man-made arson case. And judging from the situation where the door lock was pried, the suspect was likely to enter the room first and then arson."
Yang Lin then added: "A few fingerprints were collected on the door lock and they have been entered into the system for comparison, but there is no matching result yet. The metal container suspected to be a gasoline barrel is difficult to extract fingerprints because it has been burned, but we are still thinking of ways."
Yang Sen continued to speak: "The footprint model on the windowsill has been analyzed. Based on the size and pattern of the footprints, it is initially inferred that the person who left the footprints is between 1.65 and 1.7 meters tall, and is lighter. He may be a young man or a thin woman. Moreover, judging from the focus and strides of the footprints, this person is relatively hasty when he is moving. In addition, the overall traces on the scene show that although the suspect was not professional when committing the crime, he moved quickly and had a certain understanding of the on-site environment, and may have stepped on the point in advance."
Zhang Hui then reported the results of the visit and investigation: "According to the description of the neighbors, a thin person wearing a hat and a mask appeared at the victim's doorstep before the fire, and his behavior was very suspicious. The height and clothing characteristics matched the footprints analyzed by Yang Sen. We have retrieved the surrounding surveillance video and are carefully analyzing the video, hoping to find more clues about this person. Although the suspect has not been identified yet, there is a direction and we will continue to follow up."
After listening to everyone's speech, Lu Chuan looked solemn: "This fire is likely a premeditated crime. The murderer pried the door and then set fire. What is the purpose? Why should he attack an elderly man living alone? These issues must be clarified as soon as possible. Zhang Hui, the surveillance video side has increased the manual analysis and strive to lock the suspect's whereabouts as soon as possible; Wang Shuai, the on-site investigation side carefully sorted out this side to see if there are any missing clues. The technical department cooperated with all its efforts to speed up the progress of fingerprint and trace analysis."
"I understand!" Everyone responded in unison, and then they all started to work hard.
After the case analysis meeting ended, the entire criminal investigation detachment took action quickly, but as the investigation gradually deepened, the road to case investigation became increasingly rugged.
The surveillance and investigation team led by Zhang Hui collected all surveillance videos within a radius of five kilometers around the crime scene, including road surveillance, store surveillance and residential community surveillance. The team members kept checking day and night, their eyes covered with bloodshots, staring at the screen tightly, not missing any details. However, the slim and suspicious person wearing a hat and a mask seemed to have evaporated from the world and never appeared in surveillance again.
They tried to use technical means to enhance the image of the blurred surveillance screen, but due to the old surveillance equipment and the dim light on the night of the fire, the processed picture still cannot clearly present the suspect's face.
Wang Shuai once again organized personnel to conduct a re-inspection of the fire scene. They searched inch by inch, hoping to find the key clues that were missing. With his rich experience, Yang Sen repeatedly studied the traces of the scene, trying to find a new breakthrough from the burned items and messy footprints. But apart from the clues that have been obtained before, no more useful information was given on the site.
The current survey office, which is responsible for the comparison of fingerprints and footprints, is also in trouble. Entering the fingerprint of the system, no matching object was found in the huge database, which means that the suspect is likely to have no criminal record and has never entered the police's sight before. After analysis, the footprints extracted from the windowsill were found to be common styles on the market and are sold in major shoe stores. This feature cannot be used to narrow the scope of the suspect. Although technicians tried various advanced comparison algorithms and analysis tools, the results were still not satisfactory. (This chapter ends)
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