The cases filed against arrested Jubo league leader Khaled Mahmud Bhuiyan have been transferred to Rapid Action Battalion (RAB) for a thorough investigation.
Earlier, the elite force appealed to the home ministry through the Police Headquarters to get the task.
The RAB is also likely to get the job of investigating the cases filed against GK Shamim.
The Dhaka Metropolitan Police's Detective Branch has already sent all the case documents and seized elements of Khaled Mahmud Bhuiyan to the RAB.
Khaled, who is now under the grilling of police, will be sent to the RAB for further interrogation.
Mizanur Rahman Bhuiyan, assistant director of RAB (legal and media wing), said they have got the permission to investigate two different cases filed against Khaled.
"We have got the documents of two separate cases filed under Arms Act and Narcotics Control Act," the RAB official added.
But he could not confirm who will investigate GK Shamim's cases – the DB or the RAB.
However, several sources from the RAB and DB informed that the GK Shamim's cases will also be transferred to the elite force.
As the RAB arrested Khaled, it can investigate the cases in a better way, Sarwoer Bin Kashem, director of RAB's legal and media wing told The Business Standard.
He informed that the RAB-3 will investigate the cases.
The black chapter of GK Shamim
During an interrogation, GK Shamim admitted to his involvement in tender manipulation, but denied any connection with illegal casino business, according to intelligence sources.
He described how he got big projects from the Public Works Department by bribing a section of corrupt politicians and government officials.
"Shamim was ready to give 1 percent to 15 percent to avail a big project," the intelligence sources added.
The drive against illegal activities will continue
The RAB will continue the drive against all kinds of illegal activities, including corruption and irregularities.
The decision was taken at a meeting with the participation of all battalion chiefs and other top officials at the RAB Headquarters on Wednesday afternoon.
They were instructed to conduct drives sincerely and cautiously, an official, who attended the meeting, told The Business Standard.
"The drive will continue as per directives from the higher authorities. We have a list of more than 300 officials and politicians who are involved in illegal activities, and their income sources are unknown," the officer added.
Another source from the RAB informed that more than 100 officials of Rajuk, Public Works Department and other offices are under the scanner.
"We are collecting evidence against the officials, they have to face the legal action," the source added.
Nepalese nationals flee through Banglabandha
At least 150 Nepalese nationals, who were involved in the casino business in Bangladesh, fled the country through Banglabandha Land Port, intelligence sources said.
"We have checked the CCTV footage of the clubs and their residences and also interrogated more than 10 people who knew the Nepalese citizens. They ran away between September 18 and 19," the sources further said.
"They chose the Banglabandha port as it is close to the Nepal border. And they couldn't manage air tickets," the sources said.
"Some local politicians and port employees helped them flee," intelligence sources further said.