After Director Ma gave the order, the people inside quickly evacuated.
All windows and doors on the first and second floors were opened, waiting for the scene to evaporate naturally.
"Well, let's wait a bit before going in." Director Ma looked at the cordon and said, "Pull the cordon outwards a little more to prevent people from watching."
…
"Captain Zhao, take Xiao Wang with you to back up all the video footage nearby. Captain Li, take Xiao Bai to take a look upstairs and stabilize the homeowner..." Director Ma began directing the scene.
This is a row of commercial streets, with an underground garage below, some ordinary residential buildings above, and basement shops on the first floor.
The thief entered by renting the shop upstairs in advance, and then this afternoon, he started to break through the floor between the upstairs and the gold shop.
The buildings here are relatively new, and the floor structures are all reinforced concrete. It should be extremely difficult to break through them, but with the presence of hydrofluoric acid, reinforced concrete is no better than plastic or wax.
Hydrofluoric acid is completely different from the hydrogen cyanide in the previous suicide case of Sun. Since it cannot be completely ionized in water, hydrofluoric acid does not belong to the strong acid series, but this does not mean that it is not fierce. In fact, except that its action speed is not that fast, its acidity can be said to be very strong.
Because of this, this thing is also a controlled item, which ordinary people cannot get. However, because it is a controlled item, once it appears, it is generally not used for good purposes. However, as a police officer, after Bai Song mentioned hydrofluoric acid, everyone else was not unfamiliar with it. Because this acid has other uses in many cases...
Downstairs, Director Ma listened to Hao Zhenyu's report and gained a better understanding of the scene.
This kind of theft is unheard of, and mainly because it makes too much noise. Does this thief really think he can get away? This kind of theft will leave behind a huge amount of evidence...
A normal thief would just pick locks, pry doors open secretly, etc. He wouldn't do that with alarms and surveillance cameras on and making such a big noise.
But everyone present, including the gold shop owner, was a little impressed by the thief's "hardcore operation". Such imagination is really rare.
After on-site investigation, it was found that it was indeed hydrofluoric acid that melted through the floor boards, and a large amount of it was used. The thief first pried open the floor of the bedroom upstairs, then drew a circle on the cement floor, and then surrounded it with a plastic sheet. He then sealed the plastic sheet with a substance of unknown composition on all sides, and then poured in hydrofluoric acid.
Hydrofluoric acid has a strong corrosive ability on silica and concrete, but the speed is not fast. This is an ongoing process and requires continuous cleaning.
Since the corrosion does not go directly downward but diffuses, the further it dissolves downward, the larger the hole becomes, and eventually it dissolves through.
This substance has very special properties. It is a weak acid.
Weak acids should be learned in junior high school, that is, acids such as acetic acid that cannot be completely ionized in water. However, when the concentration exceeds 5 moles per liter, self-ionization will occur. At this time, hydrofluoric acid is a very strong acid, and it is no problem to corrode the steel in reinforced concrete.
This stuff is poisonous. High concentrations of hydrofluoric acid will naturally generate acidic fumes, which are devastating to the respiratory tract. The lethal dose is only one or two grams. Therefore, gas masks are only generally effective against this. Even if the room is full of residues, full-body protective clothing and oxygen respirators should be worn.
Bai Song is currently studying inorganic chemistry, which is a very basic knowledge point.
The situation upstairs is that I dare not enter the bedroom casually. Firstly, I am afraid of damaging the scene. Secondly, I am worried about the quality of the floor and hope that something unexpected will happen.
The homeowner was really crying. In this situation, who should he ask for compensation? How should he repair the house? He could only seal it off for the time being.
The second floor was blocked off first, and the homeowner was taken to the police station to take a statement.
Captain Li and Bai Song went downstairs and came to Director Ma, where they reported the situation on the second floor in detail.
There are no really good conditions for entry now, and everyone has heard about the power of hydrofluoric acid. Director Ma will not let anyone in no matter what. He is a little scared. If it weren't for Hao Zhenyu's rich experience and requirements that everyone must wear protective gear and gas masks, there would have been a big problem by now.
The damage caused by hydrofluoric acid to the human body is a chronic process. It will actively react with calcium and magnesium ions, causing the organs that rely on these two ions to gradually fail. Problems usually occur only after a few hours, and by the time the problem is discovered, it is already too late.
Director Ma confirmed again and again, but he was still worried, so he arranged for the police station to take four on-site investigators to the hospital. Wang Huadong and Sun Jie both had certain skin diseases and needed to use calcium gluconate gel for protection in time. This thing was really fierce.
The scene is right here. It is better not to investigate for the time being than to put his men in any health or safety hazard.
The last time he was doing a facial sketch, Director Ma was unwilling to find someone outside the branch. This time he was no longer vague and directly called the relevant department of the Municipal Bureau.
After all, he was already the deputy director, so Ma Donglai called the city bureau command center directly and described the situation in detail. In addition, he had actually reported once through the radio station, and this call was mainly for help.
When it comes to dangerous chemicals, the city’s power is stronger, and it’s perfectly normal to report such matters.
While waiting, Director Ma held a meeting on site.
According to the items and evidences collected at the scene, the stolen jewelry basically matches the description of the jewelry store owner. There are six or seven jewelry cabinets in the store, half of which are silver jewelry and half are gold jewelry. In each cabinet, there are also a few diamond rings and platinum jewelry.
The thief was very targeted in his theft. He went straight to the cabinet where the bracelet was stored and left the others alone.
The quality of this cabinet was not as good as expected. It was a reinforced iron cabinet that could not withstand the crowbar. The thief seemed to be well prepared. He went straight to the point and took away dozens of bracelets and sporadic diamond rings under the cabinet.
The store has a safe. Generally speaking, new goods or goods that are not on display, as well as gold bricks and gold ingots, are always placed in a large safe worth hundreds of thousands of yuan. The store clerks do not have the key to the safe, so the items are placed in the cabinets every day.
The thief did not touch the safe or other cabinets, and at present, this cabinet is indeed the most valuable cabinet in the entire store. Because even if there are 100 rings in the other cabinets, they only weigh about 400 grams.
I have to say that this was a successful action, and compared to many stupid thieves, it must have taken a long time to plan.
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