From Time Magazine:
U.S. Secretary of State Condoleezza Rice landed in Islamabad on Thursday walking on a diplomatic tight-rope. She had just been through India and knew that New Delhi wanted Washington's help in getting Pakistan to crack down on groups implicated in last week's terror attack on Mumbai. But she also knew that such a crackdown would be unpopular in Pakistan and could very well destabilize its weak civilian government. How then to mollify India's saber-rattling public while getting Pakistan's officials to act against their own interest? The two nuclear-powered nations of the subcontinent have been to war against each other three times, and tempers are now rising on both sides of the border.
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My Comment: The problem is that India now strongly believes that elements of Pakistan's ISI service were directly involved in this attack. This perception will be very difficult for Pakistan to shake off.