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"NIA is working on local suspects behind the blasts," a police official said.
According to police officials, NIA officials have questioned some local people over the past two days.
Ten bombs exploded in Bodh Gaya July 7, in which two Buddhist monks were injured, and police recovered three live bombs.
A special court has also been set up here to hear the case of serial bombings, a police officer said.
The court has been established in the Patna civil court, said the official who is assisting the NIA's probe into the July 7 terror attack.
Maoist guerrillas have denied their involvement in the serial bomb blasts at Bodh Gaya.
Bihar police officials have suspected the Maoists' involvement in the bombings.
The NIA detained six people but released all of them after questioning.
The Mahabodhi temple - a Unesco World Heritage site - is where the Buddha, who was born in neighbouring Nepal, attained enlightenment around 2,550 years ago.
