USA -backed Syrian forces are launching an offensive against ISIS aimed at driving the militant group out of its remaining strongholds in northeast Syria.
President Trump authorized airstrikes on Syrian targets to retaliate, and the U.S., Britain and France carried out airstrikes on areas allegedly linked to Syria's chemical weapons program.
The new military offensive will aim to oust IS militants from a vast plain in the town of Hajin along the eastern side of the Euphrates River and north of Abu Kamal town along the Iraq-Syria border.
Lelwa Abdullah, a spokeswoman for the Kurdish-led Syrian Democratic Forces in the eastern Deir el-Zour province, said Tuesday the final phase of the operation against IS in the area has begun.
On Monday, Iran's supreme leader, Ayatollah Ali Khamenei, issued a veiled threat to Israel without referring directly to Sunday's attacks.
The Britain-based Syrian Observatory for Human Rights said it was not clear if USA -led coalition or Iraqi warplanes carried out the attack Tuesday in the Hassakeh province.
Air strikes killed at least 23 civilians on Tuesday in one of the last pockets of ISIS-controlled territory in Syria, according to Syrian state media and an opposition-linked monitoring group, as US-backed forces in the area announced they have resumed their campaign against the extremists. "Our heroic forces will liberate these areas and secure the border.We welcome the support of the Iraqi forces". The state-run Syrian Arab News Agency said 25 civilians were killed in the airstrikes south of the town of Shadadi, blaming the US -led coalition.
US-backed Syrian militias on Tuesday relaunched their offensive to seize the last territory Islamic State controls in the east near the border with Iraq.
The SDF halted its fight against IS in eastern Syria and turned westward in mid-March to fight a Turkish incursion in the Kurdish enclave of Afrin.
An array of Syrian and Iraqi forces has driven IS from almost all the territory it once held in the two countries.
The 42 people freed on Tuesday are the first batch of more than 80 to be released.
Insurgents have agreed to a series of evacuation deals for areas around the capital that have been besieged for years and subjected to heavy bombardment by government forces.
A soldier in Syria's President Bashar al-Assad forces near the Yarmouk Palestinian camp in Damascus.