The latest move follows Friday’s court order to place Zaman and Feza’s other outlets under the management of government trustees.
"Cihan, the only news agency that was monitoring elections besides state-run Anadolu, now under trustee control," Today’s Zaman tweeted.
Cihan, the only news agency that was monitoring elections besides state-run Anadolu, now under trustee control pic.twitter.com/ZCi5GZBFjy— Today's Zaman (@todayszamancom) March 5, 2016
It added that trustees blocked access to the agency after the takeover.
RSF ranks Turkey 149th out of 180 countries in press freedom.
Earlier on Saturday, Russian Foreign Ministry spokeswoman Maria Zakharova called on Western powers to press Turkish leadership to comply with European and international commitments toward freedom of expression and the media.
European Parliament President Martin Schulz said he intended to raise the press crackdown issue with Turkish Prime Minister Ahmet Davutoglu at the EU-Turkey summit on Monday.