Kausar is suspected to be a regular at the house in Khagragarh were the blast took place.
The CID is also searching for one Abul Kalam, a resident of Mangalkote area of the district.
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The mobile phone from which the calls were made were seized by the police from the house after the explosion.
"From the video clips that were recovered from the mobile, several footages of attack on World Trade Center, lectures on Jihad and other training modules were recovered," a senior CID officer said.
Three persons, including two women, have been arrested so far in this connection.
Those arrested include Hafez Mollah alias Hasan who was picked up by the CID from his house at Khar Duttapa in Purbostholi.
On the basis of information gathered from Hafez Mollah, the police released a sketch of the prime suspect who is based in Bangladesh.
The sketch has been sent to all the police stations of Burdwan and nearby districts and railway stations to nab him, CID officers said.
The CID officers said that the mastermind behind the blast visited the house a couple of days before the blast to prepare a blue print of subversive activities.
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