India's home secretary has said that Wednesday's series of bomb blasts in the western city of Pune were a "planned and coordinated" act.
RK Singh said forensic experts were examining two unexploded devices and looking for clues.
The "low intensity" explosions went off within minutes of each other, injuring one person.
yesterday’s blasts came on the day India's new Home Minister, Sushilkumar Shinde, took up his post.
Although the Pune police said the blasts appeared to be the work of a "mischief-maker", federal authorities said a terror attack could not be ruled out.