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Osama bin Laden was aided in hiding out in Pakistan by a "support network" the extent of which the U.S. is still trying to understand, President Obama said Sunday.

The president said that bin Laden, who'd been hiding out in a compound in Abbottabad, Pakistan for at least five years before being killed in a U.S. raid last Sunday, had been the beneficiary of others in his efforts to evade American forces.

"We think that there had to be some sort of support network for bin Laden inside of Pakistan. But we don't know who or what that support network was," Obama said Sunday on "60 Minutes" on CBS. "We don't know whether there might have been some people inside of government, people outside of government, and that's something that we have to investigate, and more importantly, the Pakistani government has to investigate."

The idea that bin Laden had been able to hide out so long in relatively plain sight -- Abbottabad is home to a military acad! emy, and many neighbors in bin Laden's neighborhood are reportedly retired military -- has provoked suspicion by senior lawmakers.

Sen. John Kerry (D-Mass.), the chairman of the Senate Foreign Relations Committee, said Sunday that he found it difficult to believe that some members of the Pakistani government had no knowledge of bin Laden's whereabouts. Some other members of Congress have called for cuts in the billions in aid doled out by the U.S. to Pakistan this year.

Tom Donilon, the president's national security adviser, said on Sunday morning's talk shows that there was no evidence that senior members of Pakistan's political, military or intelligence communities knew about bin Laden's location. Pakistan's ambassador to the U.S. similarly denied any prior knowledge of the al Qaeda leader's whereabouts, though ABC News reported Sunday evening that a senior Pakistani official suspected that some "rogue or retired" members of Pakistan's intelligence! agency may have assisted bin Laden.

Obama said th! at the P akistani government has indicated "a profound interest in finding out what kinds of support networks bin Laden might have had," and that the U.S. would expect Pakistan to follow through on an investigation.

The president acknowledged differences between the U.S. and Pakistan, but characterized the country as an overall partner in the war on terror.

"What I can say is, is that Pakistan, since 9/11, has been a strong counterterrorism partner with us. There have been times where we've had disagreements.  There have been times where we wanted to push harder, and for various concerns, they might have hesitated," Obama explained. "And those differences are real.  And they'll continue. But the fact of the matter is, is that we've been able to kill more terrorists on Pakistani soil than just about any place else. We could not have done that without Pakistani cooperation."