"We will take up strongly with our neighbors that the use of their territory for launching attacks on us will not be tolerated," he said. "And that there will be a cost if suitable measures are not taken by them."
Pakistani President Asif Ali Zardari has denied Pakistani involvement and condemned the attacks, telling The Hindu: "I empathise with the people of Bombay. I feel the pain. I feel their loss and my heart goes out to their loss and the people you have lost."
[A]s the President of Pakistan let me assure you [that] if any evidence points to any individual or group in my part of the country, I shall take the strictest of action in the light of the evidence and in front of the world... Without any hesitation whatsoever, no matter where it may lead.
The two nuclear-armed neighbors have been rivals since they were partitioned into separate countries in 1947, after British-controlled India gained independence.
The Mumbai attacks have raised the specter of renewed cross-border tensions. But Brajesh Mishra, a former Indian national security adviser, says in an interview with AFP that beyond saber rattling there is little that India can do to Pakistan.
"There is little to suggest that the gunmen were sponsored by the Pakistani government," he tells AFP.
The Times of India reported on Monday that Azam Amir Kasab, the only gunman captured alive and a Pakistani citizen, has provided authorities with the names of "at least five" Mumbai locals who helped the gunmen plan their attack.