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World leaders gather in New York this week to tackle a host of crises: the violence Islamic State militants are wreaking in Iraq and Syria, the exponential spread of the deadly Ebola virus in Africa and deadlocked negotiations on Iran's nuclear program.

Kurdish militants in Turkey have issued a new call to arms to defend a border town in northern Syria from advancing Islamic State fighters, and the Turkish authorities and United Nations prepared on Sunday for a surge in refugees.

A sprint race car driver died after crashing during practice at a Wisconsin dirt track on Saturday, the raceway said in a statement. Scott Semmelmann, 47, died from his injuries after crashing during a practice session around 6:00 p.m., the Beaver Dam Raceway said on its website.