ISIL terrorist group has released a video purporting to show the beheading of British aid worker David Haines - an act described by the British prime minister as "pure evil".

ISIL terrorist group has released a video purporting to show the beheading of British aid worker David Haines - an act described by the British prime minister as "pure evil".

The video, released late on Saturday, shows Haines, 44, being killed in a desert location by a masked man. The father of two children, from Perth in Scotland, was abducted last year while working for the French aid agency Acted.