The Syrian military is not allowing terrorists that launched a surprise offensive on Aleppo to establish well-entrenched positions in the city and is gathering forces for a counterattack, the country’s General Command has said. It admitted, however, that dozens of its troops have been killed in the fighting.

Earlier this week, the Hayat Tahrir-al-Sham (HTS) terrorist group, an offshoot of Jabhat al-Nusra, and its allies launched the first major attack in Syria in years, capturing large swaths of land in Idlib and Aleppo and pushing back government forces.

In a statement on Saturday, the Syrian General Command said that the attack was “supported by thousands of foreign terrorists, heavy weapons, and a large number of drones.” It said that the military has fought battles over an area exceeding 100km in a bid to halt their advance.