Police have arrested an associate of the insurgent group Kuki Chin National Front (KNF), Lal Lian Siam Bom.
He was arrested by members of joint forces from Bethelpara in Ruma on Tuesday (April 9) night, Bandarban Superintendent of Police (SP) Saikat Shaheen said.
Lal Lian Siam Bom son of late Thon Alh Bom of Ruma Sadar Union.
After his arrest, he was produced in court on Wednesday (10 April) and after the hearing, the court ordered him to be sent to prison.
On 7 April, the Rapid Action Battalion (RAB) arrested Bandarban KNF's chief coordinator Cheosim Bom, 55.
Earlier, several men and women from the Bom community were arrested from Ruma, Thanchi, and Bandarban Sadar in multiple operations by joint forces in connection with the bank robbery and weapon theft.
A jeep driver named Kafil Uddin from Thanchi Sadar was also arrested. All were sent to jail by the court.
On 2 and 3 April, a group of armed men attacked three branches of Bangladesh Krisi Bank and Sonali Bank in Ruma and Thanchi upazilas of Bandarban within a span of 16 hours.
A manager of Sonali Bank's Ruma branch was kidnapped, and over Tk17.5 lakh was stolen from two bank branches in Thanchi.
They also looted firearms from security officers of the banks. The robbers are suspected to be members of KNF.
The bank manager was later rescued by RAB.
Following the incidents, the Bangladesh Army, the Rapid Action Battalion, the Bangladesh Police, and the Bangladesh Border Guard launched a joint operation to root out the KNF from Bandarban.