Addressing a press conference, state Home Secretary Basudeb Banerjee said that the state was also in touch with central agencies including NIA in this regard.
"A large number of chemicals have been used in bomb-making and much of these have been seized. Recovery has also been made of a large quantity of literature both printed as well as downloaded from the internet which basically relate to ways and means of making bombs and explosive devices," Banerjee said.
"I would like to deny this. Senior officials of both sides are in touch, it is a far serious matter between the Centre and the state," he said.
"Certain media reports said that posters relating to al- Qaeda were found. No such posters have been found so far. Investigation is on," the Home Secretary said.
He, however, denied that RDX was found at the blast site as reported in a section of media.
"CID has taken over the investigation and the DGP has since formed a composite task force with top officials from CID, district police, IB and Kolkata Police under the leadership of DIG CID," Banerjee said.
"The accused persons before the police arrived tried to destroy some materials by burning but a large number of incriminating documents, telephones etc have been recovered," he said.
"Investigation is continuing to see whether it has further ramification or not," he added.
These are Gulsana Bibi, wife of Shakil and Alima Bibi, wife of Abdul Halim.
"They were produced before a court and have been given nine days' police custody," he said.
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