(CNN) – Just days after the militant group the Islamic State in Iraq and Syria said they killed hundreds of Syrians, dozens of Iraqi Christian families are now fleeing the ISIS-controlled city of Mosul, hoping to avoid a similar fate.

On Friday, the al Qaeda splinter group issued an ultimatum to Iraqi Christians living in Mosul — by Saturday at noon (5 a.m. ET), they must convert to Islam, pay a fine or face “death by the sword.”

A total of 52 Christian families left the city of Mosul early Saturday morning, with an armed group prohibiting some of them from taking anything but the clothes on their backs.

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