Carol Morello Joby Warrick The Washington Post

Massacres attributed to the Islamic State have struck on four continents this year, reflecting how the appeal of the group's ideology is growing even as the territory it controls in Iraq and Syria has receded, according to experts.

Massacres attributed to the Islamic State have struck on four continents this year, reflecting how the appeal of the group's ideology is growing even as the territory it controls in Iraq and Syria has receded, according to experts.

Massacres attributed to the Islamic State have struck on four continents this year, reflecting how the appeal of the group's ideology is growing even as the territory it controls in Iraq and Syria has receded, according to experts.

Massacres attributed to the Islamic State have struck on four continents this year, reflecting how the appeal of the group's ideology is growing even as the territory it controls in Iraq and Syria has receded, according to experts.