Staff Reporter :Inspector General of Police (IGP) AKM Shahidul Hoque has said it is not clear whether militants killed Superintendent of Police Babul Akhtar’s wife Mahmuda Khanam Mitu.”Probe is still underway. Until we progress further, it can’t be told who are behind the killing,” said the police chief while addressing as the chief guest a meeting at the shooting club auditorium at Dampara Police Lines of the port city of Chittagong on Sunday.Seeking cooperation from all professional strata, Shahidul Haque requested them to give information about militant activities to the law enforcers. Chittagong Metropolitan Police Commissioner Md Iqbal Bahar presided over the meeting which was addressed, among others, by Chittagong City Corporation Mayor AJM Nasir Uddin and City Awami League President ABM Mahiuddin Chowdhury. “As police is a state force, there is no opportunity to weaken the morale of police”, he said referring to attacks on police or their family members.Meanwhile, the investigation officer (IO) of Mitu murder case has been changed to gear up the investigation.Anwar Hossain, Additional Deputy Commissioner (public relations) of Chittagong Metro Police said, “Md Kamruzzaman, Senior Assistant Commissioner of Detective Branch (DB) of CMP, has been given the charge of the case in place of DB Inspector Kazi Rakib Uddin.”The IO change has been made following an order taken by CMP Commissioner Iqbal Bahar on Saturday night, said the CMP Spokesperson.Besides, a court in Chittagong on Sunday approved seven days’ interrogation in custody for each of the suspects Abu Nosur Gunnu and Shah Zaman alias Robin over the killing of Mitu. Police had demanded 10-day demand for each of the suspects. The court granted them seven days’ remand after hearing.Mahmuda Akhtar was murdered in the southern port city of Chittagong on June 7 while on her way to drop her six-year-old son to a school bus at the GEC intersection.