The Islamic State of Iraq and the Levant (ISIL) has released a video purportedly showing two captured Turkish soldiers being burned alive, Al Jazeera reported.
The ISIL-linked news agency Amaq said last month that the group had kidnapped two Turkish soldiers, and the Turkish army separately said it had lost contact with two of its men.
Access to Twitter, YouTube and Facebook was reportedly blocked in Turkey after ISIL group released the footage.
The video's release comes a day after 16 Turkish soldiers were killed by ISIL fighters in Ankara's biggest loss so far in its unprecedented incursion into Syria.
They were killed in a succession of attacks around the Syrian town of Al-Bab on Wednesday that included three suicide car bombings.
Turkish troops entered Syria on August 24 in support of pro-Ankara Syrian rebels, with the aim of ousting ISIL as well as Kurdish militia from the border area.
At least 38 Turkish soldiers have been killed in the operation, which the Turkish government has dubbed Euphrates Shield.
Speaking earlier on Thursday, Erdogan vowed no let-up in the ongoing campaign.
"Yes, maybe we will have to lay martyrs to rest," he said in a speech in Ankara.
"But we are determined to preserve their memory and protect what they left us and continue this struggle."
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