By Ralph Boulton ISTANBUL (Reuters) - Turkey's spymaster discusses possible military intervention in Syria with army and civilian chiefs, and days later it all appears on the Internet. This breach appears to highlight a shocking truth for Prime Minister Tayyip Erdogan: that Turkey can ** longer keep even top-level security planning secret, despite his purge of thousands of officials to root out a covert network of enemies he accuses of sabotaging the state. Erdogan was out of public action on Friday, resting his voice strained by campaigning for local elections this weekend - the first in a string that will decide the future of a man who has reformed Turkey fundamentally but is **w accused of authoritarian and divisive tendencies. Foreign Minister Ahmet Davutoglu, in whose ****** the security meeting took place, said "everyone and everything within the Foreign Ministry will be investigated with utmost scrutiny" - a measure of the alarm stirred by the tape and fears of others that might follow.