Leon Panetta, the CIA director, has said that the US does not know the location of all of Pakistan's nuclear weapons but is confident they are 'pretty secure'

The admission by the chief of the Central Intelligence Agency was made amid growing concern about the country's nuclear facilities falling into the hands of the Taliban or al-Qaeda, and also claims that Pakistan is increasing its number of warheads.
Mr Panetta was asked at a forum organised by the Pacific Council on International Policy if nuclear weapons in Pakistan are better guarded than those in the former Soviet Union.

"Obviously, we do try to understand where all of these are located," he replied. "We don't have, frankly, the intelligence to know where they all are located."
He added that the US is confident that Pakistani government has a "pretty secure approach to try to protect these weapons".
"It is something that we continue to watch. The last thing we want is to have the Taliban have access to nuclear weapons in Pakistan."
At a congressional hearing last week, Admiral Mike Mullen, the chairman of the US Joint Chiefs of Staff, was asked whether there was evidence that Pakistan was adding to its nuclear arsenal. He replied: "Yes."
The Pakistani government denied the claim.