Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) - Iraq's largest Christian town has been overrun by the same militant Islamists who have gained a foothold in parts of eastern Syria and western and northern Iraq.
The latest advance by ISIS (or the Islamic State, formerly known as the Islamic State in Iraq and Syria) has caused thousands of Christians in the city to flee, just as other minority groups targeted by ISIS have done, as well as Shiite Muslims.