Gupta said, more arrests were possible and incriminating evidences have been seized. A laptop that was seized was immediately disabled by the militants, and the police is trying to retrieve the software.

"It is now clear that Abdullah was the mastermind of Patna serial blasts. He had phoned Umar Siddiqui nearly a month ago saying that he would come to Chhattisgarh to stay and had sought his help. They had met earlier too", said Gupta.