foreign secretary Shamshad Ahmad made a statement on 31 May warning that an escalation of the limited conflict could lead Pakistan to use "any weapon" in its arsenal. This was immediately interpreted as a threat of nuclear retaliation by Pakistan in the event of an extended war, and the belief was reinforced when the leader of Pakistan's senate noted, "The purpose of developing weapons becomes meaningless if they are not used when they are needed". Many such ambiguous statements from officials of both countries were viewed as warnings of an impending nuclear crisis where the combatants would consider use of their limited nuclear arsenals in "tactical" nuclear warfare in the belief that it would not have ended in mutual assured destruction, as could have occurred in a nuclear conflict between the United States and the USSR. Some experts believe that following nuclear tests in 1998, the Pakistani military was emboldened by its nuclear deterrent to markedly increase coercion against India. The nature of the India-Pakistan conflict took a more sinister turn when the United States received intelligence that Pakistani nuclear warheads were being moved towards the border. Bill Clinton tried to dissuade Pakistan prime minister Nawaz Sharif from nuclear brinkmanship, even threatening Pakistan of dire consequences. According to a White House official, Sharif seemed to be genuinely surprised by this supposed missile movement and responded that India was probably planning the same. In an article published in a defence journal in 2000, Sanjay Badri-Maharaj, a security expert, claimed while quoting another expert that India too had readied at least five nuclear-tipped ballistic missiles. Sensing a deteriorating military scenario, diplomatic isolation, and the risks of a larger conventional and nuclear war, Sharif ordered the Pakistani army to vacate the Kargil heights. He later claimed in his official biography that General Pervez Musharraf had moved nuclear warheads without informing him. Recently however, Pervez Musharraf revealed in his memoirs that Pakistan's nuclear delivery system was not operational during the Kargil war; something that would have put Pakistan under serious disadvantage if the conflict went nuclear. The threat of WMD included chemical and even biological weapons. Pakistan accused India of using chemical weapons and incendiary weapons such as napalm against the Kashmiri fighters. India, on the other hand, showcased a cache of gas masks as proof that Pakistan may have been prepared to use non-conventional weapons. US official and the Organisation for the Prohibition