Authorities carried out 36 raids during the three-day period, seizing equipment, documents and more than a dozen guns, state-run Anadolu Agency said.
Turkey faces multiple security threats, including Kurdish militants and ISIS (also known as Daesh), both of whom have been blamed for bomb attack in the last year.
The autonomy-seeking PKK is considered a terrorist organization by Turkey, the United States and Europe. It first took up arms against the government in 1984. Since then more than 40,000 people, most of them Kurds, have been killed in the violence, Reuters reported.
Turkey's largely Kurdish southeast has been scorched by renewed fighting after a two-and-a-half year ceasefire between the government and the PKK broke down in 2015.