Turkey's communications authority has blocked access to the social media platform Instagram on Friday.
The regulator did not provide a reason for the decision.
Turkish media reported that the block was in response to Instagram removing posts by Turkish users expressing condolences over the killing of Hamas political leader Ismail Haniyeh.
The presidential communications director criticised the Meta-owned platform for preventing users in Turkey from posting messages of condolences for Haniyeh.
Turkey is observing a day of mourning for Haniyeh on Friday.