"Hence we have requested Pakistan to fulfil her commitments to us," he said.

Maintaining that New Delhi had earlier given evidence to Islamabad on the deadly attack on Indian Embassy in Kabul, Menon said, "We are hoping that the previous pattern (of not cooperating) is not repeated in this case."

Under international conventions and SAARC Charter, Pakistan was obliged to extradite the perpetrators of the terror attacks in India, he said.

The material handed over to Pakistan in New Delhi and Islamabad includes the records of interrogation of arrested terrorist Mohd Ajmal Kasab, details of the terrorists' communication with elements in Pakistan during the attack, details of the weapons or equipment recovered from the crime scene and details of data recovered from GPS instruments and satellite phones, Menon said.

"It is hard to believe that something of this scale that took so long in preparation and of this nature that amounts to a commando attack could occur without anybody, anywhere in the establishment knowing this was happening. This beggars my imagination. Wherever the investigation leads, we will follow," the Foreign Secretary said.