Police arrested four suspected criminals, including Kala Mobarak, also known as Golakata Mobarak, during a pre-dawn operation on Wednesday in the Shahnagar Pollanpara area of Lelang Union in Fatikchhari. Officers recovered four firearms, 23 rounds of ammunition, three magazines and spent cartridge cases, Superintendent of Police Masud Alam said at a Thursday press conference at the Chattogram District Police office.

Police said one recovered weapon was a Brazilian-made 9mm foreign pistol that matches the list of government weapons looted from Kotwali police station. After reviewing CCTV footage of the killing of Jubo Dal leader Masudul Haque Chowdhury, investigators identified Kala Mobarak and initially believe the 9mm pistol was used in the murder. Chowdhury was shot dead publicly in Rauzan's Pahartali area on June 13.

The other recovered weapons included a 7.65mm foreign pistol, a foreign revolver and a locally made pistol. Police describe Kala Mobarak as a close associate of David Emon and Raihan and as a principal shooter for the Boro Sazzad group. Investigators will examine serial numbers, official records, ballistic evidence and the weapons' supply route.