As expected, the detective found nothing. The surveillance footage near the building where the crime occurred was "frozen" and nothing could be found.

Just like the surveillance in the office building of the County Bureau’s Criminal Investigation Brigade.

However, not all surveillance cameras in the community have been frozen, which would be too fake and easy to spot. Just like the office building of the County Bureau's Criminal Investigation Brigade, only a few surveillance images have been manipulated.

And only the period from 9pm to 5:50am last night, and from 7:30am to now is frozen. From 5:50am to 7:30am, the monitoring is also normal for the past two hours.

I think this period of time coincides with sunrise, and the sky is about to get brighter. The picture is still fixed at night, and it is easy for flaws to appear.

Several map detectives marked the motionless surveillance points one by one, and then connected them into lines on the map. They also calculated the suspect's path in and out of the community and the crime scene.

It just doesn't seem to make much sense.

When Qi Yuan conveyed this discovery to Su Ping, seeing that he remained silent for a long time, he said: "Captain Su, I personally feel that there may be more than five connections between this murder case and the gas leakage and ignition incident in the brigade.

It’s done.”

"Yeah." Su Ping nodded: "Fix the surveillance screen... Generally speaking, it's not a very clever operation. It's not something I haven't encountered in the past. It's even more clever, which is to fix the surveillance screen within a certain period of time.

The method of monitoring and looping playback to try to deceive us has also been used by murderers.

I asked professionals, the method is not difficult, the key is whether they can think of it. This method was used in both cases, so it is unlikely that the perpetrators had the same idea, and it was more likely that they were the work of the same group of people.

There is also a difficulty, that is, how to invade the monitoring system.

Needless to say, the security monitoring aspect of the brigade is either directly disconnected from the Internet, or connected to an intranet, which is physically isolated from the Internet. No matter how skilled the hacker is, there is no way to remotely intrude into it and manipulate it.

Unless they use a terminal device that is connected to both the internal network and the external network as a bridge. Or, there is no need to intervene in the internal network, just connect a terminal device connected to the external network to the monitoring system. Of course, just go to the monitoring room directly

You can also directly operate your hands and feet on several monitoring probes.

As for community monitoring, I asked when I came here that their monitoring system is not connected to the Internet and is only saved locally.

To sum up... If you want to do monitoring, whether it is safer, connecting to a device to remotely do it, or taking a risk and doing it directly, you must have an "internal response" to operate it.

Among them, the county bureau brigade has their people, which is reasonable. But if the property management of the community also has internal agents, it is a bit exaggerated and completely unnecessary. So I think someone should use some reasonable excuses to get it.

Access to the community surveillance system makes it easier for them to do anything.

It's very possible that... it was a colleague in the team who transferred surveillance to the community on the grounds that the case was needed, and took the opportunity to cause trouble.

Of course, in theory, to collect physical evidence such as surveillance, you need a letter of introduction, a notice of evidence collection, and a copy of the police ID. But generally for non-public units, such as community property management, basically if we just say it verbally, they will not

It would be difficult, but after all it was not a big deal and they had nothing to lose.

Therefore, it is probably impossible to find this person out through procedures. Fortunately, this matter should not have happened too long ago, at most it was only a week. Then the security guard should have an impression. "

Upon hearing this, Qi Yuan immediately said: "Then let someone ask the security guard?"

Su Ping nodded: "Yes, but don't make it public. Send a message to Xiao Wang and ask him to see which of our colleagues in the second squadron is free and arrange a visit, so as not to alert the enemy."

Qi Yuan blinked: "Wouldn't it be better if our colleagues in the trace inspection department asked directly?"

Su Ping:......

After a few seconds, he slowly turned away, coughed twice, and said, "Then call someone. Remember, don't use the walkie-talkie. You can make a call or send a text message, or WeChat."

"Okay." Qi Yuan immediately took out his mobile phone and made a call.

Although Su Ping said that texting via WeChat would work, there was no guarantee when he would be seen, so it was better to call directly.

The other end got through quickly. Qi Yuan told him what happened and that it was Su Ping who told him.

A few minutes later, Tu Zhen called back, and Qi Yuan immediately answered the call and turned on the loudspeaker.

They reported a name - Tong Haojie, and after reviewing the surveillance, they found that he had indeed been to the surveillance room last night and tinkered with it for a while. Since then, the footage from several surveillance cameras in the community had been

It was frozen, and there was no movement again until 5:50 in the morning, and it was frozen again at 7:30.

Obviously, in just a short period of time, a program should have been implanted in the surveillance camera to manipulate the surveillance footage.

A scheduled opening and closing program should have been added to it so that it can be unfrozen at dawn to prevent other surveillance screens from turning on while these cameras remain dark, thus arousing suspicion.

Generally speaking, it is not very difficult. As long as you can think of it, you can always come up with the program.

"Tong Haojie..." Su Ping frowned and said in confusion: "How could it be him? What happened? He teamed up with outsiders to kill his family? Isn't it possible? Is this kid so cruel?

?”

Qi Yuan shook his head to express his ignorance.

Su Ping clicked his tongue, then pinched his chin and became confused.

Two minutes later, he looked at Qi Yuan again: "Call over there again and ask if Tong Haojie is the only one who has been to the monitoring room recently. Also, ask carefully, why did Tong Haojie go to the monitoring room... Forget it.

, the left and right monitoring rooms are also right next to Gate 3, it’s not that far away, so let’s go directly there.”

"Okay." Of course Qi Yuan had no objection. He immediately opened the door and got out of the car, and then walked to the monitoring room with Su Ping.

After walking about two hundred meters and three to four minutes, we arrived at the control room.

At this time, in the monitoring room, apart from the two security guards, there were only two picture detectives from the detachment, Liu Xun and Xiao Zhao. As for the picture detectives from the brigade, they had already found an excuse to send them away when they arrived.

gone.

"Captain Su." Liu Xun and the others saw Su Ping and immediately stood up to say hello.

Su Ping waved his hand and asked, "Except for what you just reported, you learned nothing?"

"Nothing." Liu Xun shook his head gently.

"Well..." Su Ping frowned slightly, but he was not disappointed. After all, he had already prepared, so he went straight to the point and assigned tasks to them, saying: "In this way, you should check it carefully. In the near future... I will temporarily take one month to

Let’s check whether any other colleagues have been to the community or entered the monitoring room during this period.”
Chapter completed!