The Islamic State group has released a video claiming to show the killing of 11 Christians in Nigeria.
IS said it was part of its recently declared campaign to "avenge" the death of its leader Abu Bakr al-Baghdadi during a US raid in Syria in October.
No details were given about the victims, who were all male, but IS says they were "captured in the past weeks" in Nigeria's north-eastern Borno State.
The 56-second video was produced by the IS "news agency" Amaq.
It was released on 26 December and analysts say it was clearly timed to coincide with Christmas celebrations.
President Muhammadu Buhari has condemned the apparent killings and urged Nigerians not to let themselves be divided along religious lines.
"We should, under no circumstance, let the terrorists divide us by turning Christians against Muslims because these barbaric killers don't represent Islam and millions of other law-abiding Muslims around the world," he said in a statement.
He did not mention the identity of the victims.
The aid agencies whose staff are being held by the "Islamic State West Africa Province" (Iswap) have not yet commented.
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