Terrorists armed with submachine guns and grenades swept through India's commercial capital on November 26, attacking hotels, the railway station, a cinema, and a hospital. More than 20 foreigners were among the 174 people killed in the three-day rampage.
"There is no question of the dilution of our demand for extradition." Pranab Mukherjee told journalists commenting on unconfirmed reports that India is ready to retract its extradition request.
The Indian government said earlier that the 10 terrorists, who travelled to Mumbai by sea from Karachi, had been trained in Pakistan and were members of the Lashkar-e-Taiba terrorist organization.
Investigators have said the only terrorist captured alive, 21-year-old Azam Amir Kasav, admitted receiving military training in Pakistan.
After last November's terrorist attacks Pakistan's government sent its condolences and promised to cooperate with its neighbor.
Indian suspicions of Pakistani involvement in the attacks have inflamed relations between the nuclear-armed countries, which have in the past fought three wars.
