More than one million Iraqis have been forced from their homes during this year's unrest, the U.N. refugee agency said Friday. 

The displacements have led to a humanitarian crisis in Iraq, as fleeing families lack access to food, water, basic sanitation and shelter from the deadly summer heat. But the crisis is likely to worsen as the Islamic State in Iraq and Syria (ISIS) continues its violent campaign toward Baghdad. Just last week alone, half a million people fled Iraq's second-largest city of Mosul after it fell to ISIS fighters.

SEE ALSO: U.S. Special Forces Might Send Troops To Iraq

Today, on World Refugee Day, the United Nations High Commissioner for Refugees (UNCHR) finds that the number of refugees, asylum-seekers and internally displaced persons worldwide, at 51.2 million, is the highest since World War II. This figure, measured at the end of 2013, does not include the latest numbers from Iraq.

The first of 300 U.S. military advisers the Obama Administration is sending to aid the situation will arrive in Iraq as soon as Saturday.

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