RAB also detains his aide
Liton, the murder accused, was detained on Tuesday night, along with his aide Zakir Hossain Lara, who was arrested on the early hours of Wednesday.
RAB seized a foreign pistol from Liton, while Lara was detained with a foreign gun and 23 rounds of bullet, Major Shahriar Ziaur Rahman of RAB-10, said.
"He [Liton] was out on bail," Shahriar said. "However, he started regaining old habits. He was extorting money."
RAB-10 also detained six members of a gang named "Foinni Group" in Dhaka's Shyampur area on Tuesday evening.
RAB said the gang was involved in selling drugs, extorting, hijacking, and other criminal activities.
A case has been filed against them with Shyampur police station.