Anadolu Agency says at least one journalist, former Zaman columnist Sahin Alpay, was detained today. Zaman, which was linked to Fethullah Gulen's religious movement, was raided by police and seized by the government in March.
Earlier this week, warrants were issued against 42 other journalists, of whom 16 of them have been detained for questioning.
The detention of journalists and wide-scale purges of officials have raised concerns about a possible witch hunt in the wake of the violent coup attempt that killed about 290 people.