US Secretary of State Hillary Clinton defended Sunday Pakistan's commitment to fighting terrorism, while warning that the perpetrators of last year's Mumbai attacks must be brought to justice. "We believe there is a commitment to fighting terrorism that permeates the entire (Pakistan) government," Clinton told reporters in New Delhi during her first trip to India as Washington's top diplomat. India suspended its peace dialogue with Pakistan after the attacks on its financial capital and insists that Islamabad has yet to take sufficient measures against those responsible to warrant a resumption of the process. Pakistan is a key US ally in the fight against the Taliban and Al-Qaeda on its border with Afghanistan, and Washington has been wary of taking sides in the dispute over Islamabad's handling of the Mumbai aftermath.