<sod >Â  Last month, the SDF captured the nearby town and dam of Tabqa after Isis fighters reportedly agreed to surrender, leaving RaqqaÂ as their sole stronghold in the area.< eod>< sod > Â  In May, the SDF captured the nearby town and dam of Tabqa after Isis fighters reportedly agreed to surrender, retreating toÂ Raqqa, the sole remaining stronghold in the area.< eod>