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A spokesman for the U.S.-backed Syrian forces fighting the Islamic State group says they've made "limited advances" in the latest push on the last remaining area held by the extremists in Syria.

Mustafa Bali of the Kurdish-led Syrian Democratic Forces says there were still IS militants in the besieged village of Baghouz on Monday, mainly hiding in underground tunnels.

The offensive on the last IS-held pocket in Syria's eastern Deir el-Zour province near the Iraqi border resumed on Sunday evening, after Bali said a deadline expired for IS gunmen in Baghouz to surrender.

He says warplanes struck ammunition belonging to the extremists.

Bali said that "if as we advance, we notice there are civilians, we will do all we can to evacuate them from the battlefield."