From the Times of India: Azam Amir Kasab, the only Mumbai terrorist captured alive, explains the rationale for attacking the Chabad center, a.k.a. the Nariman House::
Kasab has told police that they were sent with a specific mission of targeting Israelis to avenge atrocities on Palestinians. This was why they targetted Nariman House, a complex meant for Israelis.
Last I saw, as the attack sites are searched, casualties stood at 174 dead, 295 injured, and unknown number of people missing. The majority of casualties are Indian.
The Wall St. Journal obtained a copy of an email sent by the Deccan Mujahideen claiming responsibility for the attacks. And The Jawa Report flags (and re-uploaded) a YouTube video originally titled "Deccan Mujahideen."
But whether or not the terrorist's primary motives were to target Hindus or Jews, and the possibility of formal ties to Al-Qaida are technical questions that miss the larger point. Bottom line: the war on Islamic terror is the world's fight.
UPDATE Nov. 30: Australian columnist Greg Sheridan may be on to something.
UPDATE Dec. 2: David Aaronovitch gets it.