The White House has called on Pakistan to investigate the network that sustained Osama Bin Laden in his secret compound where he was killed last week.
But National Security Adviser Tom Donilon told NBC TV he had not seen any proof that the government in Islamabad knew the al-Qaeda chief’s whereabouts.
Mr Donilon also said the intelligence cache seized from the hideout was the size of a “small college library”.
Pakistan has denied knowing Bin Laden was holed up in Abbottabad.
Mr Donilon said the Pakistani authorities needed to establish how the al-Qaeda leader had lived for six years a short drive from the capital and right next to a military academy.
“There was some support network in Abbottabad, Pakistan, with the support of Bin Laden,” Mr Donilon told NBC’s Sunday talk show Meet The Press.
“We haven’t seen evidence that the government knew about that. But they need to investigate that.”
American intelligence agencies have been poring over a haul of computer files seized from the hideout where the al-Qaeda leader was killed in a US commando raid.
“This is the largest cache of intelligence derived from the scene of any single terrorist,” said Mr Donilon. “It’s about the size, the CIA tells us, of a small college library.”
On Saturday, the Pentagon released five home videos found among the material featuring Bin Laden, with the audio track removed.
It included a video message by the al-Qaeda leader to the US and footage of Bin Laden watching an item about himself on television.
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US presses Pakistan on Bin Laden