Islamic State (ISIS) members beheaded the 11 Christians in Nigeria as a revenge of death of their leader Abu Bakr al-Baghdadi. US forces had attacked the Abu Bakr al-Baghdadi in Syria in October.
According to BBC report, All 11 Christians were male, but there are no further details about the men.
ISIS news agency Amaq has released the 56 seconds on 26 December. Video was released yesterday, coinciding with Christmas in Nigeria.