ISLAMABAD, Sept 30: Tension between Pakistan and the US soared on Thursday as visiting CIA chief Leon Panetta remained adamant on intensifying drone strikes in tribal areas, saying the region was being used for planning attacks in Europe and fomenting violence in Afghanistan.Mr Panetta’s meetings with President Asif Ali Zardari, Prime Minister Yousuf Raza Gilani and Chief of Army Staff Gen Ashfaq Parvez Kayani were described by sources as extremely tense.

US Senator John Kerry also called the prime minister in the evening.

The two-day visit by the chief of the US Central Intelligence Agency comes against the backdrop of an unprecedented increase in drone strikes in Waziristan, repeated aerial incursions into the tribal areas by US-led International Security Assistance Force and revelation of a terror plot being hatched in the region to attack European cities.

Mr Panetta last visited Islamabad soon after an attempt by one Faisal Shahzad to carry out a terrorist attack and was able to persuade his interlocutors to launch an operation in North Waziristan, but at the timing of their choice.

The current spike in drone attacks — almost two dozen in September, one of which reportedly took out leading Al Qaeda operative Sheikh Fateh Al Masri on Sept 25 — is being linked to the plot to attack European cities.

According to sources, Mr Panetta snappily demanded full cooperation in neutralising the Europe terror plot, more intelligence sharing and greater ‘operational space’ within Pakistan to avert future threats.

American journalist Bob Woodward has recently disclosed in his book Obama’s Wars that the CIA was using secret ‘pursuit teams’ of elite Afghan fighters in Pakistan for hunting Taliban leaders. Analysts believe the demand for more operational space pertains to those secret units, whose presence has been denied by Pakistan.

An outline of the information regarding the European plot was shared with Pakistani leaders, who were told that a terrorist, a German of Pakistani origin identified by his surname Siddiqui, was caught as he tried to leave the Federally Administered Tribal Areas and was now being grilled at the Bagram airbase in Afghanistan.

The plot for Mumbai-style attacks in Europe in late November, involving about three dozen terrorists, is claimed to have been hatched jointly by Al Qaeda, the Haqqani network and Lashkar-e-Taiba, a group about whichPakistani leaders had been alerted by Admiral Mullen in July that it was fast becoming a global threat.

Mr Panetta hinted that although the US government did not doubt Pakistan’s sincerity and commitment in the war on terror, it feared that they might be having support of some hidden hands.

Sources said the Pakistani leaders were stunned by Mr Panetta’s menacing tone and assured him of intensifying the military offensive against militants in the tribal areas.

The operations had slackened because of the military’s pre-occupation with flood relief activities, providing a breathing space to terrorists holed up in the region.

Prime Minister Gilani was quoted as saying that despite the catastrophic floods and consequent precarious economic situation, Pakistan remained resolutely committed to the war against terror because it considered that success in the war was vital not only for peace, stability and economic development in the country, but also for the world at large.

President Zardari said: “Fight against militancy and terrorism remains the highest priority and the government is determined to pursue its struggle against militancy till its logical end.”

Both asked the CIA chief to provide detailed information about the plot and keep the ISI on board regarding progress in the probe.

The CIA chief agreed to the suggestion and said: “The US cannot confront the terrorists without Pakistan’s support… and the US will try its utmost to provide timely and credible information to Pakistan against any possible terrorist activity on its side of the border to enable its forces to take prompt action against the miscreants.”

There were clear indications in the lead-up to Mr Panetta’s visit that efforts were made to bring Pakistan’s tribal areas -- not just North Waziristan -- into focus and to increase pressure on the Pakistan Army.

First there was a sudden increase in drone attacks in both parts of Waziristan and then there were aerial attacks by helicopter gunships in North Waziristan and Kurram, one of which left three Pakistani soldiers dead on Thursday.

At the same time, a video surfaced showing stoning of a woman in Orakzai by Taliban. The release of the video is being seen by Pakistani strategists as a western effort to show that the militants were returning to areas earlier reclaimed by the army from the Taliban. And the latest in the series is the release of a video revealing extrajudicial killings in Swat. The army has dismissed it as fake and an attempt to malign the military, but US officials are reported to have sought an explanation on the matter.

Clearly concerned over the propaganda campaign, Prime Minister Gilani found it fit to tell Mr Panetta, though in the context of Mr Woodward’s revelations, that the US should avoid negative messaging which fostered ‘misperceptions and mistrust’.