Listening to Mr. Zhang Fengtian's heartfelt emotion, I suddenly felt an inexplicable sourness in my heart. A person like him, who dedicates his youth and even his life to his cause, really should not be forgotten.

In particular, it should not be forgotten by the work he loved so much.

Just when the atmosphere at the scene was a little low, Zhang Fengtian's wife's complaining voice suddenly came from the kitchen: "You old man, do you still think you are young?" Do you know why the state sets the retirement age? It is to let you go home to care for the elderly, and what you are afraid of is those of you who do not accept old age. ”

After she finished speaking, she walked out of the kitchen with a plate of fruit, gently placed it on the coffee table in the living room, and said to me: "Xiao Mu, eat some fruit, you're welcome." ”

"Thank you, auntie." I politely replied.

"Wife, I'll get the crabs I bought back in a while, and I'll steam them! Then give me two taels of liquor! Zhang Fengtian said with a smile.

"What kind of wine? The doctors told you that you can't drink anymore, and you don't want your legs?! His wife glared at him angrily.

Zhang Fengtian was like a child who had been criticized by his parents, with some dissatisfaction in his eyes and an embarrassed smile on his face.

"Isn't this a guest at home, besides, my leg is already fine." Zhang Fengtian tried his best to explain and patted his right leg.

"Your legs are fine, if you pedal the bicycle for a few more days, you won't have your legs, and you will be in a wheelchair directly." His wife cursed him.

"What do you know, pedaling a bicycle is exercise, go get crabs, Xiao Mu came to me for business." Zhang Fengtian saw that he couldn't talk about the other party, so he quickly waved his hand to change the topic.

"Okay, okay, you talk about business." The wife turned around and went into the kitchen to handle the crabs.

"Xiao Mu, you must have encountered a problem when you came this time." Zhang Fengtian immediately changed to a more serious expression and asked me seriously.

I nodded and said in a deep voice: "This morning, there was an explosion in a studio in the central business district, the cause of the explosion was a man-made bomb, and after the identification of the technical department, the bomb was detonated by a Motorola mobile phone, and the model and style of the mobile phone are very old,"

After speaking, I took out the Motorola mobile phone chip from my pocket and put it on the coffee table, and said in a deep voice: "This is the mobile phone chip found at the scene." ”

Hearing that there was an explosion, Zhang Fengtian immediately cheered up and asked me nervously: "Are there any casualties?" ”

"At present, two people have been killed and two injured, and although the power of the bomb is very large, it uses a directional blasting technology, which is extremely targeted. Except for the studio where the crime occurred, the rest of the rooms were not affected. I replied earnestly.

After listening to this, Zhang Fengtian nodded, then picked up the mobile phone chip on the coffee table and checked it repeatedly.

He carefully observed for a while, and said slowly: "Using a mobile phone to detonate a bomb should be a way to activate the circuit to detonate by making a call or sending a text message through a specific mobile phone. ”

"Is this principle complicated?" I thought about it for a moment and suddenly asked.

Zhang Fengtian thought about it, and then explained to me in detail the detonation principle of the bomb -

"Device - improvised explosion. Device.

There are a lot of things that can be used to build an improvised explosion in reality. Device.

In addition to various explosives, artillery shells and cars are also readily available raw materials, such as car bombs, which are often used by terrorist groups.

However, for the sake of safety, explosives nowadays basically need to be detonated with a fuse. Especially the extremely stable C4 if it is not detonated. The device, even if it is directly incinerated or designed with a gun, will not necessarily explode.

So use your phone as an improvised blast. Device is the most convenient and easiest way.

In order to detonate from a mobile phone, the fuse must be unlocked in advance, so that the fuse is ready to be fired, and then ensure that the phone ignites the fuse at the moment it is connected.

The detonator is a very suitable material, the detonator can be emitted live, can be used as a fuse to detonate, in order to ensure the successful detonation, usually set up two groups of detonators.

The principle is to use a mobile phone as a remote control to receive and detonate information. The device, also for safety reasons, is designed to prevent any incoming phone call from detonating an improvised explosion. device, so improvements are usually made to bombs and mobile phones.

For example, add a single-chip microcomputer connected in series with the mobile phone, or directly program it inside the mobile phone, set up a whitelist of calls and messages, and reject calls and messages from other numbers except for the remote control number. Or add a number recognition program, only when the specified number is recognized, the circuit will fire a detonator, thus detonating the entire improvised explosion. Device. ”

Zhang Fengtian carefully explained to me the principle of remote control detonation of bombs by mobile phones, which is his specialty.

But as soon as he finished speaking, he asked a question of his own: "Use phone calls or text messages to detonate improvised explosions. The behavior of the device is already a technology that is more than ten years behind, and the current detonation technology is more advanced. Moreover, this method of using mobile phones to detonate can easily lock the mobile phone that makes calls or sends text messages through technical investigation methods, and then locks the suspect. ”

I was still carefully sorting out the principle of the bomb he told me in my mind, only to see Zhang Fengtian pause and add: "Now there are some software on the Internet that can send text messages and make Internet calls to mobile phones, and criminals can operate them on any computer." However, if there is a bad signal or when the signal may be blocked, the safest way for criminals is to detonate it regularly, and the timing of the detonation can use the alarm clock function or timer function on the mobile phone, and the most hidden way is to use the timer switch function of the mobile phone, which is to use the principle that the mobile phone will vibrate when it is turned on and off to detonate the improvised explosion. Device. ”

From the content of our conversation, it can be easily found that Zhang Fengtian is definitely an expert in EOD, and he has a lot of practical experience and theoretical experience.

He constantly told me how the bomb was detonated, and through his own experience, he gave a lot of possibilities.

"At the scene of the crime, did you find the calling card in your mobile phone? You can use your phone's call history to lock down and track down suspects. Zhang Fengtian thought about it and suddenly asked me.

I shrugged my shoulders a little helplessly and said in a deep voice: "No phone card was found at the scene, it may have been destroyed by the explosion." ”

After listening to me, Zhang Fengtian frowned, took a deep breath, and said lightly: "It's a little troublesome now." ”

"Elder Zhang, are there any factors that must be in place to plant a man-made bomb?" I fixed my mind and asked again.

"The most important thing about a bomb like this that is detonated through a mobile phone is the location where the bomb is planted, there must be a signal, and the mobile phone must be charged. The signal is easy to solve, the important thing is the power problem of the mobile phone, so the general criminal will choose the kind of mobile phone with a long standby time, if you want to delay the explosion, you will generally connect the power supply of the mobile phone with the electrical equipment in the place, so that the mobile phone can be charged all the time to ensure that when the criminal wants to detonate, there is enough power in the mobile phone. Zhang Fengtian turned his head, looked at me seriously, and said slowly.

Signal & Power ......