Islamic State said in its magazine on Wednesday that it had killed a Chinese and a Norwegian captive, showing what appeared to be pictures of the dead men under a banner reading "executed."
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The caption states that the men were "executed after being abandoned by kafir nations and organizations." ''Kafir" is the Arabic word for infidel.
ISIS had earlier identified the Norwegian man as Ole Johan Grimsgaard-Ofstad, 48, from Oslo, and the Chinese man as Fan Jinghui, 50, a freelance consultant from Beijing.
The Norwegian foreign ministry declined to comment on the claim.
In September, Norwegian Prime Minister Erna Solberg said a Norwegian man had been held hostage in Syria since January and was believed to be in the hands of Islamic State.
She said Norway did not intend to pay a ransom for his release. Solberg did not name the man but said he was in his 40s and had been held by several groups since he was first captured.
China's foreign ministry also said in September that one of its missing citizens appeared to be in Islamic State captivity.
In its latest issue, it did not give any details about how, when or where they were killed.
The magazine also carried a photo of what it said was the improvised bomb that brought down the Russian airliner over Egypt's Sinai Peninsula last month, killing all 224 people on board.