Responding to the news, the Prime Minister said:
These beheadings show once again what a depraved organisation this is.
Like others who have been murdered in cold blood by ISIL, Abdul-Rahman Kassig was a selfless humanitarian worker who had gone to the region to help care for those fleeing the Syrian conflict.
This underlines the deplorable depths to which these terrorists are prepared to go - savagely murdering a compassionate man.
My heart goes out tonight to Abdul-Rahman’s family.
For more information see ISIL: UK government response.