Meanwhile, heavy shower at the Mahabodhi temple and surrounding areas hampered investigation by the state police.
The sky opened up at around 1:30 PM putting material evidence at risk of getting damaged in the rains, sources said.
Asked about the nature of explosive used to carry out the blasts, the DGP said. "It's not an explosion of very high intensity. You can say it's a mix of low and high intensity."
The DGP said that such bombs have earlier also been used in blast incidents in Bihar.