MUMBAI, India - There are no immediate suspects in the triple bombing that killed 17 people in India's financial capital and the attack came without warning, the country's top security official said on Thursday, while shellshocked residents lambasted the government for the apparent intelligence breakdown.

The bombings, which shook three separate neighborhoods within minutes of each other during Wednesday's busy evening rush hour, were the country's worst terror strike since the siege of Mumbai that killed 166 people in late 2008.

Home Minister Palaniappan Chidambaram said Indian intelligence had not received any warnings of a possible attack on Mumbai before the latest blasts.