"Now that air drops have started, the UN in Iraq is urgently preparing a humanitarian corridor to allow those in need to flee the areas under threat," the top UN envoy in Iraq, Nickolay Mladenov, said in a statement.
The Islamic State (IS) jihadist group attacked the town of Sinjar nearly a week ago, forcing the Kurdish peshmerga troops who controlled it to retreat.
Sinjar, which lies between the main IS hub of Mosul and the border with Syria, is home to many Yazidis and other religious minorities, and was sheltering thousands of people who had been displaced in June in a previous jihadist attack.
"I welcome the cooperation between the Government of Iraq, the Kurdistan Regional Government and the international community to help prevent genocide and fight terrorism," Mladenov said.
The United States announced late yesterday it had started food drops for stranded Sinjaris and today said that a campaign of air strikes against IS targets in northern Iraq had begun.