The militants slaughtered the 16 border guards, including their commanding officer, in a surprise early morning attack on Monday, al-Issawi said.
Four others are in critical condition, he said.
The base attacked is near al-Waleed border crossing, the only crossing Iraq has with Syria that is still controlled by Iraqi forces. ISIS maintains control of almost all of Anbar -- Iraq's largest province.
(CNN)
ANN.Az
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