'Christians killed in Libya' on new Islamic State video

A new video by the Islamic State group purports to show the execution of two groups of Ethiopian Christians in Libya.

The chief executioner in the video, wearing a mask, speaks in English and says "our battle is a battle between faith and blasphemy".

One group in a desert terrain is shot to death by masked militants with machine guns while the other group is beheaded on a beach.

Those executed were described as "the worshippers of the cross belonging to the hostile Ethiopian church".

About 20 people are shown to be executed in the final moments of a 30-minute video.