US-backed forces capture Syrian air base from Isil

US-backed Syrian Kurdish forces captured a strategically important air base from Isil militants in north Syria on Sunday in the first major victory for the group since the US airlifted the forces behind enemy lines four days ago.The Kurdish-led Syrian Democratic Forces announced they had captured the Tabqa air base, 45 kilometers (28 miles) west of Raqqa, Isil's de facto capital in Syria.The US, which has provided substantial air and ground support to the SDF, ferried hundreds of SDF forces