The Pentagon has more Islamic State fighters left to defeat in Syria than it has previously acknowledged, according to a US government watchdog.
As US-backed forces begin targeting IS remnants near the Iraqi border, as many as 4,000 to 6,000 IS fighters remain in their former stronghold in northeastern Syria, a joint inspector general report to Congress on Monday revealed.
The figure, attributed to a Defense Intelligence Agency (DIA) assessment, would accord IS significantly more troop strength than the Pentagon has publicly acknowledged.
Pentagon officials estimated in December last year that as many as 2,000 IS fighters remained in Syria. The coalition has since stopped providing public estimates for IS remnants, but has not given a reason for halting estimates, even as it enters the final stage of so-called Operation Roundup that is aimed at clearing the city of Hajin near the border, where three divisions of Iraqi troops are holding a blocking position.