Bangladeshi-Canadian Tamim Ahmed Chowdhury and dismissed army officer Syed Md Ziaul Haque have been identified as the brains behind the two terror attacks.
"The law enforcement and intelligence agencies are trying to arrest Tamim Chowdhury and (sacked and fugitive) major Zia (Ziaul Haque), we seek everyone's cooperation in this regard," Inspector General of Police AKM Shahidul Hoque told reporters here.
The police chief announced Tk 2 million rewards on each of them for information leading to their arrest.
The IGP said their arrests will result into a "significant curb in militant activities".
Investigators earlier identified Chowdhury as the leader of "reconstituted" Jamaatul Mujahideen Bangladesh (JMB) or Neo JMB and the deserter military officer as main organiser of Ansarullah Bangla Team (ABT), which off late appeared as Ansar Al Bangladesh.
Independent security analysts earlier said the neo JMB was inclined to ISIS while ABT was ideologically linked to al-Qaeda though Bangladesh repeatedly declined presence of any foreign terrorist outfit in the country.
He said a massive manhunt is underway to track down Chowdhury.
A newspaper earlier reported that Chowdhury appeared as the leader and main financier of a reorganised JMB while Bangladesh earlier attributed the two attacks to the outfit.
A police officer familiar with the investigation earlier said evidence gathered from the scene of the July 26 overnight security raid at Dhaka's Kalyanpur area, when nine presumed militants were killed, led police to identify Chowdhury, believed to be in his mid 30s.
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