The Islamic State group has released a video showing the beheading of US aid worker Peter Kassig in a warning to Washington as it prepares to send more troops to Iraq.
Islamic State militants threatened slain American journalist James Foley and other Western captives with execution, waterboarding and starvation ahead of their beheadings, according to a media report.
The family of slain Steven Sotloff said they were relishing seeing the terrorist being punished.
IS executioner known as 'Jihadi John' was revealed to be a university graduate from London
Jihadi John, the dreaded Islamic State executioner killed in a US drone strike in Syria last week, reportedly fathered a son who is automatically entitled to British citizenship.
The 26-year-old British terrorist was seen executing Western hostages in IS videos.