There was no immediate claim of responsibility for the attack. Picture used for illustrative purposes only.
An ambush on a bus in a remote eastern Syrian region left at least 15 pro-government fighters dead on Monday, the Syrian Observatory for Human Rights said.
The war monitoring group said it could not immediately confirm who carried out the attack, which took place in Raqqa province where the Daesh militant organisation is still active.
Meanwhile, a ministry statement said that 11 government troops and two civilians were killed in what it said was a terrorist attack on a civilian transit bus. It said another three soldiers were wounded.
Syrian state news agency SANA said the attack took place in the Jabal Al Bishri region of the vast province of Raqqa.
The Syrian Observatory for Human Rights said the ambush had been carried out by Daesh sleeper cells that launch hit-and-run attacks in the country's desert areas.
There was no immediate claim of responsibility for the attack.
Syria's 11-year-old conflict has carved the country into various zones of control, with government troops and allied fighters controlling the most territory.
A patch of northwestern territory is held by Turkish-backed rebels and more hardline groups while Kurdish-led forces with US backing hold the northeast.
One of the deadliest bus ambushes was in December 2020, when 28 people were killed in an attack on a main highway in Syria's eastern Deir Al Zor province.
Despite losing their last piece of territory in Syria in 2019, Daesh has maintained hideouts in the vast Syrian desert from which it has carried out ambushes and hit-and-run attacks.
Turkey’s president says he won’t halt its military offensive in northeast Syria, despite growing pressure and sanctions from NATO allies. President Recep Tayyip Erdogan’s comments came as Washington,
The raid killed four people, including two civilians, said the war monitor, although it was unable to determine whether the other two deaths were civilians or soldiers.
The United States vetoed a UN Security Council resolution on Tuesday that called for an immediate ceasefire in Gaza, drawing stern criticism from allies as President Joe Biden faces mounting pressure to temper support for Israel.
Two friends in western France have built a 16-metre high replica of the Eiffel Tower from recycled wood, which they hope to display along the path of the Summer 2024 Olympic torch relay and on Olympic sites.
The vote in the 15-member Security Council was 13-1 with the United Kingdom abstaining. The United States circulated a rival UNSC resolution that would support a temporary cease-fire in Gaza linked to the release of all hostages, and call for the lifting of all restrictions on the delivery of humanitarian aid.