Not sure I believe this "bulletin". Seems to that any Iraqi could get into Mexico very easily and conduct the trasaction there. They don't seem to have any security except on their southern border.
Mexicans trying to go to San Fran to sell anything except high test drugs doesn't make sense.
All the known Al Queda folks we have nabbed have been near Sacramento and Klamath Falls. No where near SF.
Have you ever tried to cross the border into Mexico?
I think it's one that will wind up on snopes.com.