PAKISTAN: A war over Kashmir is most likely to start with limited Indian strikes against Islamist militant bases in Pakistani-controlled territory, according to military analysts and intelligence sources. But these could quickly escalate into a wider military conflict, even leading to Pakistan using nuclear weapons, they warn.
This is the scenario which has been presented to the British and US governments and which has prompted them and other countries to upgrade warnings to their citizens to leave the two hostile powers as soon as possible.
The British Prime Minister, Mr Tony Blair, and Foreign Secretary, Mr Jack Straw, are said to be "very gloomy" about the situation.
"The Indian military are psyching themselves up saying, 'Let's have a good battle and clear Kashmir once and for all'," a senior military source said.
President Pervez Musharraf of Pakistan is being influenced by what one source described as "shadowy corps commanders, who have spent all their life fighting and preparing to fight the Indians".
One source familiar with the military hierarchy of the two countries pointed out that Gen Musharraf was the architect of an offensive in Kashmir two years ago when Indian troops forced back the Pakistanis.
He said it would be extremely difficult for the Pakistani leader to accept defeat for a second time. His military commanders would say to him: "Use it (the nuclear option) or go," the source suggested.
Indian military commanders are reported to have drawn up plans for air strikes against lines of communications between Pakistani Kashmir and the rest of the country, followed by the deployment of helicopter-borne troops to establish forward positions from which they could monitor more easily the movement of Islamist groups.
"The idea would be to destroy as many terrorist camps as possible and even 'straighten out' the Line of Control," said Mr Gary Samore of the London-based International Institute for Strategic Studies.
India would argue it is fighting terrorists in exactly the same way as the US is in Afghanistan.
If its strikes were limited to Kashmir, the dangers of escalation would be significantly less, some analysts and military observers said.
"Pakistan would not use nuclear weapons in the context of fighting limited to Kashmir," Mr Samore said.
But others said even Indian strikes limited to Kashmir could lead to heavy fighting between ground troops, backed up by artillery, in which Pakistani forces would eventually be overwhelmed.
The danger, according to intelligence assessments, is that Gen Musharraf would then have little option but to escalate the conflict. "There is a hell of a risk, the consequences of it getting out of hand are huge," a senior military source said.
He said that, although Gen Musharraf was trying to control extremists in the military, he had not fully succeeded.
"There are fanatics in Pakistan who would use nuclear weapons," he said.
Analysts said the conflict could spill over into the plains of Pakistani Punjab and threaten some Pakistani cities, including Lahore and Islamabad.
Pakistan, with an air force and army much smaller than India's, would then face the difficult choice of capitulating or using nuclear weapons.
That is the nightmare scenario being spelt out to ministers in London and in Washington, who share the same intelligence assessments.
The US has stepped up pressure on Gen Musharraf and his colleagues.
The question being asked is whether it will succeed not only with them, but also with the Indian government. "But if the Russians (traditional allies and arms suppliers to India) have not influenced them, no one could," one source said yesterday.