The U.S. military said Tuesday it struck a mosque that had allegedly been used as an Islamic State control center, as American-allied Syrian forces battled the extremists in their last stronghold in eastern Syria amid reports of more civilian casualties.

Russia has demanded the US pull troops out of Syria in a dire warning against Washington, as Moscow increases to roll-out withdrawal plans for the region.

ISIS chiefs have stashed away millions to fund a new wave of attacks against Britain and the West – as the terror group faces being stamped out once and for all.