Anadolu Agency said the bodies of 60-year-old Arouba Barakat and 22-year-old Hala Barakat were discovered late yesterday after friends worried about the journalist, who had not showed up for work, alerted police.
There has been a string of attacks against activists in Turkey. The Islamic State group has claimed the killings of four Syrian journalists in Turkey.
According to Syrian opposition activists, Arouba was a member of the Syrian National Council. She had backed the uprising against Syria's president but also criticised some arms of the opposition.
Anadolu said the women were stabbed.