He says people with information about the chairman’s location will be rewarded
Detective Branch senior officer Mashrukur Rahman Khaled said the arrests were made on Saturday from the capital's Moghbazar.
They have been identified as Shafiqul Islam Rana, 'Apple,' 'Ibrahim,' and 'Imran'.
Of them, Rana is a former army corporal, police said
Deputy Commissioner Khaled said they posed as police detectives and planned to commit crimes like abduction and extract ransom for releasing hostages.
"They used to wait in front of banks in cars equipped with walkie-talkies, fake pistols and vests used by DB officers.
"As soon as their targets walked out of the bank, they would whisk them away in their car posing as officers and would then ask families for ransom," Khaled said.