TEHRAN (Press Shia Agency) – More than 25 terrorists were killed after clashes broke out between two militant groups in the northwestern Syrian city of Aleppo.

The so-called Syrian Observatory for Human Rights said on Wednesday that the clashes erupted in the city’s militant-held eastern region between the Fastaqim Union and Nour al-Din al-Zenki Movement terrorist groups. 

The fighting broke out after al-Zenki militants attacked regions held by the rival terrorist group after it arrested the al-Zenki's commander, Press TV reported. 

Aleppo, once Syria’s second largest city before the start of war in the country, has been a major frontline in the fight against different Takfiri militant groups. The city has been divided into two parts. Militants have occupied the city’s eastern parts for four years.

The latest developments come as reports suggest that major Takfiri groups fighting in Syria are fractured more than anytime as they are struggling to close ranks in the face of army advances on various fronts. 

The rift between them is getting deeper as the army has made major advances in its military campaign against the militants, retaking several villages in the Eastern Ghouta region of Damascus.

Syria has been gripped by civil war since March 2011 with various terrorist groups, including Daesh (also known as ISIS or ISIL), currently controlling parts of it.

According to a report by the Syrian Center for Policy Research, the conflict has claimed the lives of over 470,000 people, injured 1.9 million others, and displaced nearly half of the country’s pre-war population of about 23 million within or beyond its borders.