"We have alerted the Indian security agencies against his (Tamim Chowdhury's) possible escape to India to evade the arrest," Bangladesh Police chief AKM Shahidul Hoque told PTI.
He said a massive manhunt is underway to track down Bangladeshi-Canadian Chowdhury as he is suspected to be the mastermind of the recent terrorist attacks in the country.
Hoque said during his recent New Delhi visit accompanying Home Minister Asaduzzaman Khan, he alerted the chiefs of National Investigation Agency (NIA) and CBI against Chowdhury and "Indian security agencies are looking for him as well".
A newspaper earlier reported that Chowdhury appeared as the leader and main financier of a reorganised Jamaatul Mujahideen Bangladesh (JMB) while Bangladesh earlier attributed the two attacks to the outfit.
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Hoque, however, said a reconstituted JMB, which he preferred to call "neo-JMB", was identifying them as IS operatives in Bangladesh.
A senior officer at the police headquarters supplemented Hoque, saying the new outfit, mostly led by close relatives of the original outfit, adopted a revised philosophy for the outfit three years ago which was inclined to that of IS.
The police chief's comments came days after Bangladesh identified Chowdhury as the mastermind of the July 1 terrorist attack on a Dhaka cafe.
Police earlier this week said a security raid on a terror hideout last week provided them the clue to detect him as the architect of the recent Islamist assaults adding that he returned home from Canada three years ago.
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.
The family members of the five militants, who were shot dead in a gunfight with security forces at the Artisan, have not come forward to claim their bodies.