Murder of Alan Henning 'unforgivable' - Cameron.
You need to install Flash Player to play this content. David Cameron: ''The murder of Alan Henning is absolutely abhorrent, senseless, completely unforgivable" The murder of hostage Alan Henning was "completely unforgivable" David Cameron has said, as he vowed the UK would do all it could to find the killers. A video purporting to show Mr Henning being beheaded has been released by Islamic State (IS) militants. Mr Cameron said IS was a "repulsive" and "barbaric" organisation.