An Istanbul court on Saturday remanded in custody ahead of trial nine staff from the opposition Cumhuriyet newspaper, in an intensifying crackdown a day after the leaders of the country's main pro-Kurdish party were also jailed.

There had been growing international alarm over the use of a state of emergency implemented in the wake of the failed July 15 coup against critics of President Recep Tayyip Erdogan.

Nine MPs from the opposition pro-Kurdish People's Democratic Party (HDP), including its co-leaders Selahattin Demirtas and Figen Yuksekdag, were jailed ahead of trial by the courts Friday on terror charges.

The nine Cumhuriyet staff placed under arrest after their detention earlier this week include some of the most prominent names in Turkish journalism, the state-run Anadolu and private Dogan news agencies said.

They include Cumhuriyet's editor-in-chief Murat Sabuncu, celebrated cartoonist Musa Kart and influential anti-Erdogan columnist Kadri Gursel.