Pakistan’s ambassador to the United States vowed Sunday that “heads will roll” following an investigation into how Usama bin Laden was able to hide out for years in a military city in northern Pakistan, as President Obama said the terror leader must have benefited from a “support network” inside Pakistan.

The comments are the latest developments in the diplomatic dance both countries have been performing since the U.S. raid on bin Laden’s compound last weekend.

Top U.S. officials say they have serious questions for Pakistan’s government and that an investigation is critical. Pakistani officials continue to criticize the Obama administration for crossing its borders for the raid without first telling Islamabad.

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