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With grim faces, Panetta and Mullen accuse Pakistan of 'exporting violence' to Afghanistan

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Defense Secretary Leon Panetta and Chairman of the Joint Chiefs of Staff Adm. Michael Mullen testify before the Senate Armed Services Committee, Thursday, Sept. 22, in Washington, D.C. Panetta and Mullen testified before the committee on U.S. strategy in Afghanistan and Iraq.

AP reports that Defense Secretary Leon Panetta and Chairman of the Joint Chiefs of Staff Adm. Michael Mullen accused Pakistan of "exporting violence" to Afghanistan, putting in jeopardy the delicate U.S.-Pakistani partnership against terrorism and possibly a successful outcome to the war in Afghanistan. The two were testifying at a Senate Armed Services Committee hearing on U.S. strategy in Afghanistan and Iraq.

Maybe Mullen was feeling like he could be a little more honest since he's retiring next week. Or it could be the start of the administration taking a more critical approach to an ally.

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Slideshow- Afghanistan: Nation at a crossroads

Update: The New York Times reports that Panetta and Mullen also said that the Pakistani spy agency, the I.S.I., had a direct role supporting the militants in the attack on the U.S. Embassy in Kabul last week. Full story.

Story: As tensions rise, Pakistan warns US: 'You will lose an ally'

NBC's Andrea Mitchell interviewed Pakistani Foreign Minister Hina Rabbani Khar, who is at the UN this week, about the allegations. Watch the video interview below.

The Obama administration has increased the rhetoric and pressure on Pakistan to act against terror groups in the country. Pakistani Prime Minister Hina Rabani Khar reacts to the request.