Middle Euphrates River Valley, Syria 0
15 March 2019

A senior U.S. official indicated that "we are just about finished with the campaign along the Euphrates to defeat the last territorial holdings of the [ISIS] 'caliphate'. They're down to a few hundred fighters and less than a square km of land". He also noted that U.S. assessments indicate "that there's between 15,000 and 20,000 ISIS armed adherents active, although many are in sleeper cells, in Syria and in Iraq". 

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