The senior official said that the US and Britain "have been told very clearly that there is a limit to our patience".
One of the first casualties of events that followed from September 11 has been Indo-Pakistani relations.
Rescued from a historic low by an ultimately fruitless but mostly warm-spirited summit meeting between Pakistan's military ruler, General Pervez Musharraf, and Indian Prime Minister Atal Behari Vajpayee in July, they have now plummeted to a danger point not seen since Pakistan's invasion of Indian territory in the mountainous region of Kargil in the spring of 1999.
That mountain conflict brought the nuclear-armed South Asian neighbours, which have fought three wars since independence in 1947, to the brink of a fourth.
But skilful Indian diplomacy persuaded the world that India was the wronged party, and ever since India's star has risen while Pakistan's has sunk.
The climax of the Indo-American honeymoon came with US President Bill Clinton's visit to India in February of last year. His tacked-on, half-day visit to Pakistan by contrast had all the lustre of a trip to the divorce court. September 11 changed all that.
Pakistan, a military dictatorship, was no more enticing than before, but its support in any US conflict with Afghanistan's Taleban was seen as absolutely vital.
Musharraf, the former commando whose strongest quality is decisiveness, wasted no time in giving it. Domestic trouble ensued, but suddenly the world was beating a path to his door.
Sanctions were lifted, debt rescheduled, new aid promised.
And India, its rapid offer of help to the US spurned or at least ignored, stood glowering on the sidelines.
India's angry position is clear: Pakistan, embraced as a key part of the solution to the terrorist menace, is actually a key part of the problem.
"Pakistan," said Indian Foreign Minister Jaswant Singh on BBC TV, "is the epicentre of terrorism."
The mayhem at Srinagar was almost certainly caused by a militant group with roots, recruits and training camps in Pakistan.
India regards America's pursuit of the Taleban and Osama bin Laden as myopic, because it ignores the long terror campaign in Kashmir. But from the US perspective, this is the worst possible moment to raise the Kashmir question.
Powell must try to repair the damage.
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Map: Opposing forces in the war against terror
Afghanistan facts and links
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