There was an on-going CIA operation to move heavy weapons to Syria and Stevens was providing diplomatic cover for same.
http://piggington.com/obama_intellectual_or_empty_suit#comment-220744%5B/quote%5DInteresting, but if it was caused by this.. then the only group who would do this would be associated with the existing regime in Syria. I don’t think that Assad would want to add US to the mix by attacking diplomatic personnel on foreign soil. Under this scenario, Al Qaeda would not be interested in stopping the heavy arms. They would have more opportunities with Assad gone.
That said, I don’t think it is likely that the diplomats know of CIA operations within the country. It doesn’t always get flowed down to them. Operations are ‘stovepiped’ so there is plausible deniability on the part of the diplomat. The article also said:
there’s evidence that U.S. agents—particularly murdered U.S. ambassador Chris Stevens—were at least aware of heavy weapons moving from Libya to Syrian rebels.
which does not state certainty, nor direct involvement.