He was talking to newsmen at a programme after inaugurating a sculptor of a freedom fighter at Harirampur upazila parishad in Manikganj district.

"A fair investigation into the Avijit murder was conducted and a group of militants of the banned militant outfit Ansarullah Bangla Team (ABT) took part in the killing mission. Militants were active in the country during this period but they failed to continue it due to the proactive role of the law enforcement agencies," he said.

The US Department of State offered the reward for information on the attack against Avijit Roy and his wife Rafida Ahmed. The Secretary of State has authorised the reward for information leading to the arrest or conviction in any country of anyone involved in the murder of Avijit and the attack on Ahmed, according to US Department of State.

Writer and founder of Mukto Mona blog Avijit Roy, son of late physicist Ajoy Roy, was hacked to death, but his wife Banya escaped with serious injuries after unidentified assailants attacked them with meat cleavers near TSC on the Dhaka University campus on the evening of 26 February 2015, as they were returning home from the Amor Ekushey Boi Mela.

Avijit's late father filed a murder case with Shahbagh police station the very next day.