He said the first person to tell him was done casually duing a long discussion...indicating perhaps it was a friend of his...who might have been currying favor, but assumed he wouldn't tell.
Then another "senior admin. official" confirmed it with a "oh you know about that" comment.
Then a third confirmed, the CIA official.
The "leak" might have been more negligent than purposeful. But maybe not.
Do you have a link to that BBC article???