Turkish authorities have detained a further 18 people over an alleged plot to create chaos and trigger a military coup, local media say.
The suspects, 17 of whom are military officers on active duty, were rounded up in a nationwide operation, CNN-Turk and Haber-Turk TV channels said.
Another 49 officers were detained on Monday, 31 of whom have been charged.
The case has increased tension between Turkey's military and its Islamist-rooted ruling party.
News of the arrests came shortly after Turkish Prime Minister Recep Tayyip Erdogan vowed that any conspirators would face justice.
WE SHOULD TOSS TURKEY OUT OF NATO.