Al Jazeera's Stefanie Dekker, reporting from the Turkish city of Gaziantep along the Syrian border, said that the offensive was initially launched in November last year and was being conducted in phases.
"The first phase was pushing from the north. Second one was pushing from the west. And now, in the third phase, the forces are trying to push from the east," she said.
"There is also heavy fighting that has been going on north of Raqqa city, where the SDF are backed by coalition air strikes.
"Also overnight, the coalition forces took out the last bridge crossing the Euphrates. There were five bridges and all of them were taken out."...
-bth separate said the destruction of the two bridges over the Euphrates also cut off the water supply to at least part of the city. Essentially the city is being encircled for siege.