When Ling Ling and Wen Qiao arrived at the school gate, the fireworks show had already finished.
The school guard who witnessed everything that happened was only able to get closer after the explosion. I found the fire extinguisher that had been sitting idle in the corner for many years and put out the remaining fire.
The school gate has always been a crowded place with people coming and going. Such an "explosion" incident instantly attracted crowds of onlookers. They all raised their mobile phones and took pictures of the rare scene in front of them. In this era where everyone is a self-media, everyone has a camera on their face.
Ling Ling pushed aside the crowd in a panic and shouted: "Get out of the way! The police are handling the case, so stay back!"
But with so many people, how could a little policewoman like her be able to intimidate them?
Fortunately, the troops behind her also followed up, and together with her they managed to maintain order in the crowd.
Zhou Zhen had already called Ling Feng as soon as possible to inform Ling Feng of the situation, and they were already on the way to provide support.
The smoke after burning has not dissipated, and the black Audi car now looks like a monster spitting black smoke. A human figure with bloody flesh could be vaguely seen in the blackened driver's seat. In addition to black char marks, the car window was also covered with some reddish-brown fragments, which looked like exploded human tissue. .
In this way, this small iron box that carried people around the city on a daily basis turned into a tomb that trapped Lin Hui to death.
Wen Qiao didn't need to look to know that the person in front of him was dead. Even if he didn't die, for a person who experienced an explosion in a closed space, I don't know whether it would be more kind to die quickly, or whether it would be more hopeful to linger on.
There was a strong pungent smell in the car, including the smell of burning protein when the leather seats were burning, the smell of petroleum when the plastic parts were burning, and more obviously, the smell of sulfur emitted after the burning and explosion of gunpowder.
White smoke that was too thick to melt was still overflowing from the cracks in the car window, blocking the sight of those who wanted to explore, but with a little thought, it seems that you can see a person who was alive and kicking just now, with his whole body covered with flames. Screaming and struggling in despair, it was really a frightening scene.
Ling Ling didn't dare to look at the coffin-like car anymore and turned her back to maintain order. But the fear in her heart has not diminished. Behind her is a cruel and terrifying murder scene, but in front of her are people who are curious, excited, and even eager to try.
She couldn't help but shudder, and suddenly remembered what her teacher said when she was in school, that some perverted murderers would return to the scene of the crime after committing the crime, admiring their masterpieces and watching the nervous and serious police officers as if facing a powerful enemy.
"Is that person here now? Staring at us in the dark?" Ling Ling thought to himself. Cold sweat broke out on her head, and she scanned the crowd, but in her eyes, these people seemed to have the same face, and she couldn't tell the difference.
At this time, a hand reached out from behind her and slapped her shoulder violently. Ling Ling was like a frightened kitten, about to jump up and dodge. But before she could react, she was held down by that hand.
"What's wrong with you?" Ling Feng looked at her strangely.
Ling Ling was relieved when he saw that the person coming was his brother, and muttered dissatisfiedly: "Why are you hiding behind and scaring people!"
"When did you become so cowardly?" Ling Feng took advantage of the opportunity: "So I said, you might as well stop working in the field, which is dangerous and hard, and you might as well stay in the bureau, organize information, do publicity work, etc. .”
Ling Ling snorted coldly: "Stop looking down on others!"
Ling Feng had already expected her attitude and said no more. After taking one look at her resolute and petite back, he turned around and went back to his own business.
…
Yunhe City Criminal Investigation Detachment.
The office area is not small, but piles of documents, various daily necessities, tables and benches fill up the space here. There are several reclining chairs scattered in the gaps between the desks, and a few people sleeping with their clothes on their heads. They can't even tell the difference between men and women, let alone recognize who is who.
This is the daily routine of the criminal police team when encountering a case. In order to solve the case as soon as possible, they investigated and visited day and night, collected information, and stayed up until two or three in the morning. It was not uncommon. In order to make full use of this pitiful rest time, we can only cut out the complex and simplify it. A camp bed or even two stools can be used to sleep for a few hours, and I am very satisfied.
Ling Feng looked at his watch and saw that it was already 8:30 in the morning. Although he couldn't bear it, he still woke them up one by one and gathered them in the conference room for the meeting.
Jiang Rong was still the one making the report this time, and she seemed to have gradually adapted to the reporting job.
"The deceased, Lin Hui, was a local, 42 years old, divorced, and had a daughter with his ex-wife. She was Lin Xuerou, a student in Class 6, Grade 2, Yunhe City Experimental Middle School who was reported missing two days ago."
"After inspection, we found that the driver's seat cushion was the most severely burned part of the entire vehicle. The deceased's thighs also had obvious shattering and laceration injuries, and the skin edges of the buttocks and legs were rolled in, showing Flap-like, multi-jagged and open-shaped. The whole body was accompanied by severe burns, soot and charcoal deposits could be seen in the trachea and bronchi, and the respiratory tract showed 'heat-induced respiratory syndrome'. In addition, the concentration of carboxyhemoglobin in the blood of the deceased As high as 48%. These evidences indicate that Lin Hui was burned and impacted by flames during his lifetime. His death may have been caused by one or more of the following reasons: The first is shock or systemic system function caused by the heat of the flames. Failure, the second is poisoning or suffocation caused by toxic and harmful gases such as chlorine, phosphorus, hydrogen cyanide and nitric oxide, and the third is mechanical damage in the explosion."
"We extracted the residues of many chemicals in the car, including potassium nitrate, potassium sulfate, potassium nitrite, phosphorus pentoxide, incompletely burned carbon powder, etc., and we could also smell obvious sulfur dioxide irritation at the scene. Sexual odor, these are typical products of gunpowder detonation.”
"So we speculate that someone sprinkled red phosphorus, potassium nitrate, sulfur, charcoal and other common raw materials for making fireworks and firecrackers on the seat of the deceased. Chemically active oxidants and reducing agents are mixed together, and as long as slight conditions are applied, The two will react violently. Red phosphorus and potassium nitrate are a pair of very typical oxidants and reducing agents. If these two substances are mixed together, grinded or hit, an explosion may occur, which is very dangerous. Operation. Therefore, strong oxidants and strong reducing agents must be strictly separated in chemical management."
"After the deceased got into the driver's seat of the car, he had to stop and go unavoidably while driving. Due to the force of inertia, the buttocks and legs would generate friction against the chemicals laid underneath, thus triggering a deflagration."
Ling Ling imagined the scene Jiang Rong described - a man sitting on a firework, his butt exploded with a "bang". The flowers literally exploded. This situation was weird and bloody, and it made her shudder. At this time, her eyes glanced at a photo of the death scene, and her stomach couldn't help but churn.
Next, the police officers from the Physical Evidence Section and Technical Team began to report their findings.
Lin Hui had extensive contacts and complicated social relationships, but they did not waste too much police force in this area. The person who dropped the explosives could only commit the crime between Lin Hui's two drives, so they locked the time in the period when the car was parked at school.
The school is not a place where just anyone can come in. There are cameras at the door and guards standing guard, and strangers who come in and out will be registered. Therefore, the police can even directly target the murderer of this bombing to the school staff.
Theoretically, as long as the person who approached Lin Hui's car was found that day, the murderer could be found. But as luck would have it, his car was parked under the shade of a tree without a camera. In places like schools, during class time or when there are some special activities, there are almost no people on the street, let alone any witnesses.
The only people in the school who have anything to do with Lin Hui are the teachers in Class 6, Grade 2. So the police conducted a focused investigation on them, but still found nothing.
The case suddenly reached a deadlock.
"Is it possible that he is a student?" Zhou Zheng carefully put forward his idea.
Ling Ling rolled her eyes at him: "How is it possible? If you ask me, I think it is most likely to be the chemistry teacher in the school. What kind of phosphorus and potassium is this? It must be someone who is proficient in chemistry."
Ling Feng felt that what she said made sense. "What do you think?" he asked Wen Qiao, who had never spoken.
Wen Qiao looked erratic and seemed absent-minded.
"Jiang Rong just said that Lin Hui may have died from one or more of three reasons, and I am more inclined to believe that he died of carbon monoxide poisoning or suffocation, or that this factor was mainly responsible for his death. ." Wen Qiao said this for no reason.
"Is there any difference?" Ling Feng felt that what he said was a bit redundant: "Whether Lin Hui was blown to death, burned to death, or poisoned, it was all because someone put dangerous chemicals in his car. , shouldn’t our focus now be to find a way to find this person?”
"When we inspected the scene, through the residual products of combustion, we can deduce that the gunpowder dropped by the murderer was actually not very large, and the explosion yield was very low. Unless it is aimed at some important parts of the human body, the fatality rate of such an explosion will be It’s still relatively low.”
"But in contrast, the murderer dropped a lot of charcoal powder. Not only was there residue on the seat, but there was also a lot of unburned charcoal on the footrests under the seat. Charcoal is prone to incomplete combustion in an environment with less oxygen. Burns and produces carbon monoxide. In an environment with high concentrations of carbon monoxide, people will quickly fall into coma and lose the ability to resist."
Ling Feng gradually understood the secret: "You mean, the murderer first caused a small explosion, ignited the charcoal in the car, and produced carbon monoxide. In this way, even if the victim was not blown up by the first explosion he designed, If you die or burn to death, you will also be poisoned by this second step of his design!"
"What a terrible murderer, with a vicious mind and a clever and cautious mind!" Ling Feng said with emotion. .
But Wen Qiao just glanced at him lightly and said, "But I think he is extremely stupid and superfluous."
"Why go to all the trouble and go in a big circle when you can get there in one step with a more powerful bomb?"
