Fears of a Turkish-backed Syrian rebel attack against Syrian Kurdish forces that could undermine the US-led campaign against the Islamic State are growing amid reports that Turkey sent new military reinforcements into northern Syria, including troops and supplies.
The Syrian Observatory for Human Rights, a London-based monitoring group, reported on Wednesday that Turkish forces had crossed the Syrian border and were headed toward the rebel-held border town of Azaz, one of the main logistical hubs for Turkish operations inside northern Syria.