At a news conference in New Delhi, Ms. Rice urged Pakistan to act quickly, Reuters reports.
"We have to act with urgency, we have to act with resolve," Rice said.
"I have said that Pakistan needs to act with resolve and urgency and cooperate fully and transparently. That message has been delivered and will be delivered to Pakistan," Rice said.
The New York Times adds that Rice tried to remain neutral, calling for calm, rather than pointing fingers.
Ms. Rice said it was premature to comment on whether any particular organization was responsible for the attacks on India's financial and entertainment capital. She described the assault last week as distinct from others that had struck India since it targeted high-profile targets, including those frequented by foreigners, and appeared to be designed to "send a message."
"Whether there is a direct Al Qaeda hand or not, this is clearly the kind of terror in which Al Qaeda participates," she said.