US President Barack Obama has called on Pakistan to investigate the support network that sustained Osama bin Laden in the secret compound where he was killed last week.
In an interview on the CBS television programme 60 Minutes, Mr Obama said he had no evidence that people inside the Pakistani government had helped the al Qaeda leader.
But Bin Laden must have had support, he said, and it needs to be investigated.
"We don't know whether there might have been some people inside of [Pakistan's] government, people outside of government, and that's something that we have to investigate and, more importantly, the Pakistani government has to investigate," the President said.
Mr Obama's message was even-handed and diplomatic, the BBC reports. He was careful not to accuse Pakistan of harbouring Bin Laden.
Pakistan plays a crucial role in America's war efforts in Afghanistan and too much public pressure on Pakistan could jeopardise the relationship.