The Pakistani spy agency chief Lieutenant General Ahmed Shuja Pasha Tuesday refused to meet separately visiting U.S. Special Representative Richard Holbrooke and Chairman of U.S. Joint Chiefs of Staff Admiral Mike Mullen for their remarks over alleged link between the Inter Services Intelligence (ISI), and the Taliban and Al-Qaida, media reports say.

However, General Pasha did attend a meeting with the two Americans and Pakistani military's chief of staff, General Ashfaq Parvez Kayani, according to a statement issued by the press arm of the Pakistani Army after the two U.S. officials left Islamabad for New Delhi Tuesday night.

The U.S. think tank Starfor said Islamabad carefully stage-managed this unprecedented snub by the ISI chief to convey its resentment over a number of issues brewing between Washington and Islamabad. This sudden display of confidence on the part of Islamabad will further complicate the Obama administration's strategy on the Taliban, it said.

The snub appears also to be a part of an emerging consensus between Pakistan's military and civilian government that Islamabad needs to increase its bargaining power with the U.S. as an ally in the war against militant Islamists, the think tank said.

The ISI is peeved over the increasing U.S. unmanned aerial vehicle strikes in the Pakistani tribal belt and criticism from Mullen and U.S. Central Command chief Gen David Petraeus, who said the intelligence agency was still dealing with the Taliban and Al-Qaida.

The ISI and its support base in Pakistan establishment is also upset with American strategy of treating Afghanistan and Pakistan as one theatre and resents the U.S.'s move to involve India in Afghanistan, the think tank said.

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