Western intelligence agencies were able to form a detailed picture of  Osama bin Laden's movements in the years after 9/11, and came closer to  capturing or killing him than has so far been acknowledged, a former  European intelligence official has disclosed.
The former official, who declined to be identified, told CNN that in  2003 and 2004 an informant in the Afghanistan-Pakistan border region  with close connections to al Qaeda's top leadership provided a stream of  reliable information on bin Laden's movements. But the information was  never quite fresh enough for Western intelligence agencies to target al  Qaeda's leader.
Nearly nine years ago, bin Laden and others in the al Qaeda leadership  escaped as their haven among the caves and mountains of Tora Bora --  close to the Afghanistan border with Pakistan -- came under withering  U.S. air attacks. Despite bin Laden being the world's most sought-after  fugitive, to date very little has been reliably reported about his  movements beyond a consensus that he is now likely hiding somewhere in  the tribal areas of Pakistan.
The former official said that in the period after bin Laden left Tora  Bora, under pressure and on the run, he and his lieutenants were little  able to communicate with each other. But gradually, al Qaeda restored its communications and was able to resume meetings.  
Bin  Laden even met with 9/11 mastermind Khalid Sheikh Mohammed at some  point before the latter's arrest in February 2003. Additionally, bin  Laden and his deputy Ayman al-Zawahiri were frequently in the same area  and regularly in communication.
During this time, Western intelligence agencies were able to draw up a  detailed map tracing bin Laden's movements, according to the former  intelligence official.
 
In 2003-2004, bin Laden spent time in  several areas -- amid the rugged mountains of Pakistan's Federally  Administered Tribal areas and in Pakistan's North West Frontier  Province, a more heavily populated area where Pakistan's security forces  had a greater presence.
But according to the former official, bin Laden shunned big cities,  preferring to stay in rural areas. The intelligence stream indicated  that al Qaeda's leader also made several trips across into Afghanistan  during this period, despite the presence of tens of thousands of U.S.  troops.
In a high-stakes game of hide-and-seek, Western intelligence agencies  were always playing catch-up as bin Laden moved from location to  location. Tantalizingly at one point, according to the former official,  information about his exact location was only one week old. But the  intelligence stream on bin Laden's movements never resulted in what is  known as "actionable intelligence" that could have led to his capture or  assassination.
After 2004 the intelligence stream dried up, according to the former  official, who did not elaborate why. But he said that despite the  setback, information on al Qaeda's leaders' movements never completely  dried up; and recent intelligence suggested bin Laden and al-Zawahiri  were still in close geographic proximity and able to communicate with  each other.
However, few al Qaeda followers get to meet them. European and American  jihadists who joined up with al Qaeda in 2008 have subsequently told  Western interrogators that for security reasons access for them to bin  Laden was strictly off limits.
Bin Laden  is now mainly concentrating on providing "strategic direction" to the  al Qaeda organization, rather than involving himself deeply in the daily  running of the terrorist organization, the former official told CNN.  Raw intelligence reports leaked in July on the Wikileaks website  suggesting bin Laden took part in detailed planning of operations should  be treated with skepticism, said the former official. 
U.S. intelligence officials play down the possibility that bin Laden  might be captured soon. CIA Director Leon Panetta stated in June that  very little hard information on bin Laden's movements had come to light  in recent years.
 But on Friday, President Barack Obama said that pressure on the al Qaeda  leadership meant that "they have been holed up in ways that have made  it harder for them to operate." He added: "Bin Laden has gone deep  underground. Even Zawahiri, who is more often out there, has been much  more cautious."