Siddhiqui wanted to target Modi, during the rallies in Kanpur, Delhi and Ambikapur in Chhattisgarh, police claimed.
"Siddhiqui has admitted that he had planned the Bodh Gaya blasts. He had instructed where the explosives should be planted," Director General of Police Ramniwas told reporters here.
Siddhiqui, 35, who runs a coaching class here, is one of the eight persons arrested last week in connection with serial blasts at Modi's last month's rally in Patna. All of them are allegedly members of the banned Simi.
According Ramniwas, Siddhiqui also confessed to sheltering the culprits of Patna blasts in Raipur afterwards.
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"Abdulla, the prime accused in the Patna blasts case and Umer had also planned attack on Modi for which they had conducted recce in Kanpur, Delhi and Ambikapur ahead of the Gujarat Chief Minister's rallies," the DGP said.
They had allegedly prepared sketches of the venues, but put off the plan each time due to the heavy security.