* WHO ARE THE INDIAN MUJAHIDEEN?

Indian police say the Indian Mujahideen is an offshoot of the banned Students' Islamic Movement of India (SIMI), but that local Muslims appear to have been given training and backing from militant groups in neighbouring Pakistan and Bangladesh.

SIMI has been blamed by police for almost every major bomb attack in India, including explosions on commuter trains in Mumbai two years ago that killed 187 people.

Police said the Indian Mujahideen may also include former members of the Bangladeshi militant group Harkat-ul-Jihad al Islami.

* WHY ARE THEY SUSPECTED OF BEING BEHIND THE MUMBAI ATTACKS?

The Indian Mujahideen have made credible claims of responsibility for most of the recent major attacks on civilian targets in India over the past two years.

The Mumbai attacks appear to have been carefully co-ordinated, well-planned and involved a large number of attackers. A high level of sophistication has also been a hallmark of previous attacks by the Indian Mujahideen.

The Mumbai attacks also focused clearly on tourist targets, including two luxury hotels and a famous cafe.

In May, the Indian Mujahideen made a specific threat to attack tourist sites in India unless the government stopped supporting the United States in the international arena.

The threat was made in an e-mail claiming responsibility for bomb attacks that killed 63 people in the tourist city of Jaipur. The e-mail, signed by "Guru Al-Hindi", declared "open war against India" and included the serial number of one of the bicycles on which the bombs were left.

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