Spokesperson for the secular platform Imran H Sarker made the demand from a sit-in protest in front of the National Museum at Shahbagh on Friday.
Sarker declared to continue the programme until their demand was met.
“Those who have murdered Avijit Roy are self-confessed extremists. These militants have been threatening Avijit on the social media.
“He has been killed brutally but the killers and those behind the killing are yet to be arrested,” he said.
The blogger also demanded that the administration and the state take strict legal steps against the extremist militant outfits.
Imran noted that such brutal incidents were repeating themselves. He mentioned the killings of Professor Humayun Azad, Professor AKM Shafiul Islam and blogger Ahmed Rajib Haider.
“Then Avijit was killed yesterday. But the killer militants have not been tried,” he said.
He commented that the extremists were encouraged, as the criminals could not be traced.
“Those linked to the incidents are threatening openly. They are giving deadlines to kill. But they are not being arrested,” Sarker said.
He alleged that freethinkers were being arrested instead.
“This policy is the reason behind the expansion of radicals. This evil force is getting stronger by the day,” he said.
He urged all to raise voice against the extremists to protect a secular Bangladesh imbued with the ideals of the Liberation War.
“If we do not act now, we will never be able to do so,” he said.
