Board Thread:Fanon Canon 2/@comment-2185383-20140924182221/@comment-4869113-20140928015920

That's straight from narutopedia, who are very accurate with they write. From the passage, you can tell that Itachi approaches Hiruzen afterwards. Secondly, you see that Hiruzen had no clue that Danzo commanded Itachi to slaughter his own kin until after it had happened.