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Pakistan  government and intelligence services have insisted they shared  key  information about Osama bin Laden's compound up to two years ago  with  their American counterparts.
Although the intelligence  agency  ISI transferred information about the residence, it denies  knowledge of  the terror leader bin Laden being there.
A senior  ISI source  told me they got information that Osama's wife and sons were  living at  the compound in Abbottabad in the north-west of Pakistan, six  months  ago.
He insisted they shared this information with the CIA.
"It is as a result of the information we shared that they got Osama bin Laden," he told Sky News’ Alex Crawford.
The episode has strained an already fraught relationship between the two agencies.
The   CIA and the US administration have long held suspicions that there are   elements within the ISI who are supporting militant groups, including  al  Qaeda.
They believe an exchange of critical information  before  the navy Seal operation would have jeopardised their chances of  success,  that is, bin Laden would have been tipped off and escaped.
Pakistan's   prime minister defended his country's failure to spot that bin Laden   was hiding out near Islamabad, saying that fighting terrorism was the   whole world's responsibility.
"There is an intelligence failure of the whole world, not just Pakistan alone," Prime Minister Yusuf Raza Gilani said.
"Certainly   we have intelligence sharing with the rest of the world, including the   United States, so if somebody points out that there are ... lapses  from  the Pakistan side, that means there are lapses from the whole  world," he  said.
The ISI sources I spoke to said this had only embarrassed the agency and undermined their relationship.
"The ISI has captured so many terrorists in operations we have organised and they should not be forgotten," he said.
"Our relationship will be affected because of the manner this was conducted.
"The Americans have always talked of leakage on our side," he went on, "they always say this without any basis."
But today, check points have been re-imposed, with searches being undertaken of residents in the town.
The   renewed security comes after the man who purchased the land in  Pakistan  where Osama bin Laden's compound was built, was arrested.
It  is  believe that Gul Mohammed was taken into custody by police and will  be  interrogated by intelligence agents about the property.