The Islamic State (IS) group were responsible for an attack on a military bus in Syria's Deir Ezzor province which killed 23 government troops, according to the Syrian Observatory for Human Rights (SOHR).
The attack, which took place on Thursday in the town of al-Mayadeen in the eastern desert region, wounded an additional 10 soldiers.
The UK-based SOHR said a bus carrying a group of soldiers was ambushed and attacked with light weapons and medium machine guns.
Dozens of soldiers were missing following the attack, and some of those wounded were in critical condition. SOHR described the attack as the deadliest by IS in 2023.
There were no immediate claims of responsibility.
