Who wiretapped Turkish Prime Minister’s office, home?

During a televised interview on December 21, Turkish Prime Minister Recep Tayyip Erdoğan revealed that four unauthorized wiretapping devices had been detected in his parliamentary office and government car. A subsequent report from the Office of the Prime Minister on December 25 said that one more device had been found in Mr. Erdoğan’s home-office at this residence in Turkish capital Ankara. Who is behind the operation?