Why does Turkey blame a Pennsylvania cleric for the coup attempt?

At least 161 people have died and more than 1,400 were injured across Turkey after members of the military attempted a coup, blocking traffic on bridges over the Bosphorus in Istanbul and issuing a declaration of martial law.

 After leaving a seaside resort for Istanbul, President Recep Tayyip Erdogan addressed the nation via FaceTime, calling the attempt “treason”. And on Saturday, Mr. Erdogan declared that the coup had failed, blaming a “faction in the military, the parallels”.

The term “parallels” is used by the Turkish government in reference to the followers of Fethullah Gülen, a Sunni cleric who has lived in self-imposed exile in Pennsylvania since 1999. Once an ally, Mr. Erdogan now says the influence of Mr. Gülen as akin to that of a “parallel state”, and has accused him of plotting coups from his 26-acre compound in the Poconos....
http://m.csmonitor.com/World/Global-News/2016/0716/Why-does-Turkey-blame-a-Pennsylvania-cleric-for-the-coup-attempt