Rediff.com's Vicky Nanjappa says the Intelligence Bureau and the Home Ministry have confirmed the blasts as terror attacks. A red alert has been declared across the nation.

The IB which is investigating the case says that it is too early to determine who is behind this blast, however, the Indian Mujahideen is being considered a possibility.

Preliminary investigations have revealed that 7 IEDs were used and the explosive device was wrapped in cloth bags and tiffin carriers -- the signature of the IM.