CBS News was told that the courier was "trusted" by bin Laden. "We identified areas where this courier and his brother operated, but they had extensive operational security," said the official -- and those elaborate security procedures made the U.S. even more suspicious of whom they were catering to.
Four years ago, the United States learned the man's identity, which officials did not disclose, and then about two years later, they identified areas of Pakistan where he operated. Last August, the man's residence was found, officials said.
The residence is in Abbotabad, Pakistan, an affluent area with lots of retired military. The compound was surrounded by an 8-foot wall with barbed wire. There were extra walls inside and 2 security gates. Also telling was that they burned trash, unlike their neighbors. There was a terrace on the 3rd floor with a 7-foot privacy wall. It was a million-dollar home with no telephone or internet connections, custom built to hide someone of significance. Another major indicator was that a family lived there, one whose size and make up was same as bin Ladens.
By mid-February, intelligence from multiple sources was clear enough that Mr. Obama wanted to "pursue an aggressive course of action," a senior administration official said.

