US
The most intense attack was in the al-Koum area north of the ancient desert city of Palmyra
Syria’s southwest region is sensitive because of its proximity to the frontiers with Jordan and Golan Heights
Recent confrontation believed to be most serious between Israel and Iran since start of Syrian civil war in 2011
Says liberation of Albu Kamal is very important because it signals the general fall of terrorists in the region
The strike took place near the town of Masyaf early on Thursday, says an army statement