Early the next morning, Song Mingguang came to the telecommunications company.
“Base station?”
“That’s no problem. All mobile phones need to send signals through the base station to make calls, send text messages, or log in to the network.”
Nowadays, communication technology is far away It is much more developed than people think.
When the mobile phone makes calls, sends text messages or logs into the network through the base station, some records will be left on it.
Some records can even be restored through certain technical means even after the other party deletes them.
Song Mingguang's investigation was very detailed. He wanted to check everyone's call records, text message records, and even network registration records.
Especially the bank where coal mine funds are deposited.
The two coal mines did not have any business transactions, and the funds were all in two branches. One of them was in the first bank where the car was borrowed and the deposit was made, and the last one was in the bank where the crime occurred.
In other words, if there is an insider in the bank, then the staff of the first bank and the third bank are the most likely.
Therefore, Song Mingguang also focused on investigating the personnel conditions of these two banks.
"Captain Song, this person named Zhang Huang made a phone call 38 minutes before the case was closed."
"Check the other party's phone number to see who he called. ”
Song Mingguang’s group includes more than twenty people. It can be said that the entire communications technology elite of the BZ City Public Security Bureau is serving him.
“The time when the last bank coal mine came to deposit cash was 56 minutes from the time of the robbery.”
"That is to say, everyone must remember the answers to all the phone calls they made in the hour before they were robbed."
"Check the situation of the person who called and register them one by one."
While Wang Song and Song Mingguang were conducting in-depth investigations, Lu Chuan's work was also in progress.
The first is fingerprints.
The fingerprints on the four cash boxes have been extracted.
Lu Chuan spent most of the night doing identification and analysis.
What a pity.
There are 42 sets of fingerprints in total, 28 of which were successfully compared easily.
Due to the serious deformation of the fingerprints, it took Lu Chuan a long time to complete the remaining 14 groups.
But the results were far from ideal.
The fingerprints on it were either those of the escort or bank staff, and there were no unfamiliar fingerprints.
Lu Chuan carefully observed the four front boxes. There were some traces of friction on them, and the fingerprints were swept away. It should be that the other party was wearing gloves.
Very cautious, leaving no flaws.
But Lu Chuan originally didn’t have much hope for this.
The three robbers carefully planned this robbery. If they could leave the box at the scene, it means there will be no flaws.
Sure enough, there were no fingerprints.
Fortunately, Lu Chuan has another important clue.
Short hair.
After completing the fingerprint identification analysis last night, Lu Chuan began to process the short-haired man and extract the DNA information on it.
Early in the morning, Lu Chuan arranged for someone to go to the Cui family to extract the DNA information of the Cui family.
The other party had returned from overseas last night.
First of all, we must rule out the possibility that this short hair was not left by the Cui family, so that the dog can point to whether it was left by the suspect.
As for the gene pool...
Lu Chuan is not very hopeful.
The sample size is too small, so the possibility of success is not high.
In other aspects, everyone is also advancing work, mainly on-site investigations and visits. Find witnesses and find the whereabouts of suspects through witnesses.
However, it is obviously difficult to achieve results in a short period of time.
At the same time, an armed bank robbery occurred in BZ City, which caused widespread publicity in various fields.
This kind of case may not happen nationwide in several years.
Therefore, all levels attach great importance to the detection of this case.
Li Donglin took three to five phone calls in one morning, including the director in charge Li Gang and the main leaders.
At the same time, there is also great pressure on BZ City.
In the past year, criminal cases in BZ City have been on the rise. Originally, the economic development of BZ City was average, but now another bank robbery has occurred.
This gives the outside world some different views on the public security environment and even the investment environment in BZ City.
Therefore, it is urgent for all parties to quickly investigate cases and punish criminal suspects.
"At six o'clock in the afternoon, the case analysis meeting will be held again, and everyone will report on the progress of the work."
Li Donglin sent a meeting notice to the members of the serious crime team.
Time is tight.
Cracking the case is not a matter of idealism, and it cannot be solved by just saying it, but it is a fact that the time required by all parties is tight.
Therefore, a lot of manpower and material resources can only be invested.
Time passed quickly, and at six o'clock in the afternoon, the members of the crime team were sitting in the conference room again.
“The impact of this case is very great, and all levels of people attach great importance to it.”
When Li Donglin led the serious crime team to detect cases in the past, more pressure came from the case itself.
But this time is different. Li Donglin clearly feels the pressure, coming from all levels.
Not only the leaders of the provincial department attach great importance to it, but also the leaders at higher levels. BZ City is already like an ant in the pot.
The police chief came twice.
"The reason why I tell you this is to make you realize the urgency of solving this case."
"Come, each group will report on the progress of the work."
"Wang Song, you come first."
"Yes."
Wang Song has already identified the sellers of the robbers' explosion-proof suits.
“The explosion-proof suits worn by the robbers during the surveillance were quite special, and few were sold online. We have found a total of 72 buyers online so far.”
“As of now, we have We have contacted all 72 sellers and asked them to track the delivery orders in BZ City. "
"What we know so far is that only two sets have been sold to BZ City."
"One set was sold five years ago, and the other was sold a month ago."
"We have found out that these two sets of equipment were sold a month ago, and have ruled out the other party's involvement in the crime. It is possible that the person who sold the suit 5 years ago is no longer in BZ City and has not been contacted yet. "
"But judging from the preliminary investigation results, it is possible that this set of explosion-proof suits appeared at the scene. There is basically no sex, and the time span is too big."
"In addition, since there are three robbers wearing three sets of riot gear, I personally think it is more likely that they will purchase it together."
"Offline channels, we are currently investigating, and we have no results yet."
From Wang Song's perspective, the robbers may have thought that the police would investigate through the use of explosion-proof clothing.
So they didn’t want to purchase online.
Of course, there is also the possibility that three people bought the anti-riot uniforms separately, but mailed them to different places, and then brought the anti-riot uniforms back to BZ City in some way.
Wang Song’s report is over. (End of this chapter)