Suspected militants interrogated in Mumbai blasts

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The home ministry said in a statement police were interrogating some Indian Mujahideen members who were arrested some days before the attack, but it had no specific leads on who could be responsible.

The Indian Mujahideen is a shadowy home-grown militant group known for its city-to-city bombing campaigns using small explosive devices planted in restaurants, at bus stops and on busy streets.

The group has been accused of ties to Pakistani militant groups involved in attacks in Indian Kashmir as well as elsewhere in the country.

"It's very likely coordinated by Indian Mujahideen looking at the severity and scale of the attacks -- in the past they've used tiffin carrier bombs and IEDs," said Rohan Gunaratna, a Singapore-based al Qaeda expert.

The bombings were the biggest attacks on Mumbai since the 2008 assaults killed 166 people, raised tensions with nuclear rival Pakistan, and left a city on edge.

After a two-year chill following the November attacks, India and Pakistan have been trying to normalise ties and later in July their foreign ministers are due to hold talks.

Pakistani leaders were swift in condemning the bombings, as was U.S. President Barack Obama. Top U.S. diplomat Hillary Clinton is also due in India for scheduled talks next week.

Any suggestion of attributing blame for the latest bombings to Pakistan-based groups would complicate a fraught relationship between the two countries, and further unravel Pakistan's ties with the United States.

"We live in the most troubled neighbourhood in the world. Pakistan and Afghanistan are the epicentre of terrorism," said Chidambaram, adding that Pakistan had still not given India support in pursuing those behind the 2008 attacks in Mumbai.