Staff Reporter :At least eight criminals took part in the murder of Mahmuda Khanan Mitu, wife of Superintendent of Police Babul Aktar, in exchange of money they received through a middleman, police sources said.Police arrested two more people for their alleged involvement in the murder of Mitu from Bakalia area of the Port city Chittagong on Tuesday morning. The two arrestees were identified as Ehsetul alias Haniful Huq alias Bhola, 41, and Monir Hossain Monir, 23. Police also seized firearms used in the killing of Mitu.With the arrest of Bhola and Monir, six people have so far been arrested in connection with the gruesome murder. “Acting on a tip off, a special squad of police launched a drive in Bakalia area of the city on Tuesday morning and arrested Bhola and Monir. Out of the two, Monir supplied firearms to the gang for murdering Mitu,” Additional Commissioner (Crime and Operation) of Chittagong Metropolitan Police told journalists at a press briefing yesterday.However, sources said that the two — Bhola and Monir were arrested on June 21. Meanwhile, Home Minister Asaduzzaman Khan Kamal on Tuesday said that they have not obtained any evidence about SP Babul’s involvement in the gruesome murder of his wife Mitu.”Police have not found any evidence about Babul’s involvement in the killing of his wife Mitu yet. He (Babul) is not under police surveillance. Even we didn’t say Babul is now under police scanner,” he told journalists after attending a programme at Osmani Memorial Auditorium. He further said the issue relating to SP Babul’s alleged involvement in the killing of his wife has not come for investigation yet. “Please be patient. After obtaining intelligence report, we will tell you everything in details. We need some times for proper investigation,” Home Minister said. On Saturday, SP Babul Aktar was picked up from his father-in-law’s residence in the city’s Khilgaon area. After 15 hours interrogation, he was later set free. The relevance came in view of police interrogation of SP Babul after one of the arrestees allegedly linked the police official with the murder of his (Babul) wife. Earlier police arrested Wasim and Anwar, both from Rangunia upazila in Chittagong on Saturday. They gave confessional statements before a Chittagong Court on the next day admitting their involvement in the June 5 attack.Besides, police said that they had not found the involvement of two other people shown arrested in the case – Abu Nosor Gunnu and Shah Jaman Robin. They are now in jail on completion of their seven-day remand. Police also had detained the owner of the motorcycle and the driver of a microbus who witnessed the killing. But they were released later. Apart from the DB police, members of Police Bureau of Investigation (PBI), Criminal Investigation Department (CID), Counter-Terrorism and Transnational Crime (CTTC) and Rapid Action Battalion (RAB) also carried out investigation and working in the case.On June 5, unidentified miscreants gunned down Mitu at the city’s GEC intersection while she went there to drop her son, Mahir Akhter, 7, for a bus to Chittagong Cantonment Public School and College.