The attackers hit a military bus with an anti-tank rocket in western Aleppo province, state news agency SANA reported.

In northwestern Syria, a rocket attacked a military bus, killing 10 soldiers and injuring nine others, according to the Syrian state news agency SANA.

Insurgent attacks by pro-government groups have killed the most since Russia and Turkey brokered a ceasefire in March 2020. The truce has largely been maintained despite sporadic attacks on both sides, including continued Russian airstrikes.

The bus was attacked in western Aleppo province on Friday morning, SANA news agency said.

The agency reported that the attackers hit the bus with an anti-tank missile.

No immediate claim was made of responsibility for the attack, which was located near the border in rebel-held territory near the Turkish border.

Syrian rebel group Ahrar al-Sham posted a video on its Telegram channel on Friday showing a rocket hitting a bus, with a caption showing a military bus belonging to a pro-Assad militia in The moment western Aleppo was destroyed. Video content cannot be independently verified.

Lebanon’s heavily armed Shiite movement Hezbollah has intervened in Syria to support President Bashar al-Assad, and its leader mourned the dead in a televised address late Friday.

Those killed on the bus were pro-government Shiite fighters from the towns of Nubl and Zahraa, a pro-Damascus military source told Reuters.

During the country’s 11-year war, Assad’s government has relied on local paramilitary forces and coalition fighters from countries including Lebanon and Iraq to retake large swathes of territory.

Northwest Syria is the last major stronghold for fighting the Assad government and its allies.

Before Russia’s intervention in the Syrian conflict, the Assad regime controlled only one-fifth of the country’s territory. With support from Russia and Iran, Damascus has regained much of the territory lost in the early stages of the conflict. Moscow deployed its air force to Syria in 2015 to support Assad, and conducts regular bombing raids.

The last of the armed opposition to oppose the regime included large swathes of Syria’s Idlib province and parts of the neighboring provinces of Aleppo, Hama and Latakia.

Turkish troops supporting some insurgent groups are deployed in rebel-held areas, and the main front of the conflict, which spiraled in 2011 amid protests against the Assad regime, has been largely frozen for several years.