Islamic State says it has killed two Chinese nationals who were abducted from south-west Pakistan by armed men in late May.
The IS-linked Amaq news agency made the claim in an Arabic statement on the Telegram messaging app.
China’s foreign ministry said it was “gravely concerned” and working to verify the information.
The pair are said to have been studying at a language centre in the city of Quetta when they were abducted.
According to media reports at the time of the abduction, armed men took the couple as they left the centre. Another Chinese woman just managed to escape during the confrontation.