Police, however, claimed on Wednesday they arrested a former Shibir man, Abu Nasar alias Gunnu, who is now being interrogated.
Addressing a press briefing at the Chittagong Metropolitan Police’s (CMP) headquarters on Thursday, CMP additional commissioner (crime and operation) Devdas Bhattacharya said they will seek 10-day remand for Abu Nasar.
“A black microbus was seen right behind the bike-riding assailants at the time of the murder. We are interrogating the driver of the microbus, Jane Alam, for clues,” said Devdas Bhattacharya.
“We are examining every aspects of the murder. We, however, have yet got any any significant clues in this regard,” he added.
The police’s Detective Branch (DB) in collaboration with the Police Bureau of Investigation (PBI) and its Counter Terrorism Unit is probing the case.
Police superintendent Babul Akhtar’s wife Mahmuda Khanam was stabbed and then shot to death by three bikers in broad daylight near her residence near GEC crossing in the port city of Chittagong when she was going to drop her son for school bus on 6 June.