Washington (AFP) - US-led air strikes on a Syrian border town killed "several hundred" Islamic State fighters but it may still fall, officials warned Wednesday, acknowledging significant jihadist gains in Iraq and Syria. While Iraqi troops prevented the jihadists from seizing a lynchpin provincial capital near Baghdad, a senior US envoy admitted IS forces have scored important advances in Iraq, John Allen, a retired four-star general and US envoy to the coalition fighting the Islamic State, said it would take time to build up local forces to defeat them there and in Syria. In the border town of Kobane, Kurdish...