Terrorism is theatre and over the last few weeks, the brutal videotaped beheadings of British and American hostages by Islamic State militants have proved remarkably successful for the Islamic State
The US has resumed air strikes against positions held by militants from the Islamic State, hours after 30 countries pledged to support US plans in destroying the jihadi group.
Full statement by the Haines family following the beheading of David Haines by Islamic State militants in Syria.
A propaganda video showing the execution of kidnapped British aid worker David Haines by a militant from the Islamic States (formerly ISIS) has appeared on YouTube and other video sharing sites.
The US has confirmed that video showing the killing of reporter Steven Sotloff is authentic, but said they will not be intimidated by the barbarism for the militant group.