Displaced Iraqis from the Yazidi community settle under a bridge in central Dahuk, Aug. 14. Human rights activists say evidence of the Islamic State's violence against the Yazidis points to war crimes, and amounts to ethnic cleansing. Khalid Mohammed/AP hide caption

itoggle caption Khalid Mohammed/AP

Lincoln, Neb., is home to a sizable community of Iraqi Yazidis — including Ismaeil Khalaf, shown here in his home watching the latest news about the Yazidi crisis in Iraq. Lincoln Yazidis petitioned for U.S. intervention to prevent the genocide of their friends and family. Nati Harnik/AP hide caption

itoggle caption Nati Harnik/AP

Displaced people from the minority Yazidi sect walk toward the Syrian border on the outskirts of Sinjar mountain on Monday. A U.S. assessment team says far fewer refugees are stranded on Mount Sinjar than previously thought. Reuters/Landov hide caption

itoggle caption Reuters/Landov

Staff Sgt. Daniel Leavindofske and Senior Airman David Babcock help load bundles of halal meals onto a cargo aircraft for a humanitarian mission over Iraq on Saturday. Staff Sgt. Vernon Young Jr./U.S. Air Force via Getty Images hide caption

itoggle caption Staff Sgt. Vernon Young Jr./U.S. Air Force via Getty Images

U.S. soldiers carry Iraqi Kurdish children into the Zakho refugee camp in 1991. The U.S. military provided humanitarian relief to Iraqi Kurdish families fleeing Saddam Hussein's army. The rescue operation announced Thursday by President Obama is taking place in the same region. Joel Robine/AFP/Getty Images hide caption

itoggle caption Joel Robine/AFP/Getty Images