The 'fact' is that there are thousands of unresearched mindless people with no qualms about casually starting conspiracy theories.  If you want evidence, find some that is reliable.  Unfortuately, we don't have precedents for this situtation; we can't flip through a video log of every leader who has ever heard news tragic news.  Either way, the 'fact' is that spending ten minutes in shock after hearing of 9/11 was too natural a reaction to cause this response.