A US-backed alliance of Arabs and Kurds will launch their final assault on the Islamic State group's Syrian bastion Raqa in early summer, a commander said on Friday. 
"The attack on Raqa will take place in the beginning of the summer," Syrian Democratic Forces commander Rojda Felat told AFP without giving a more precise date.  
He was speaking in the town of Tabqa, which the SDF captured from IS on Wednesday along with its nearby dam.