According to the Syrian Observatory for Human Rights (SOHR), fierce clashes have taken place between Syrian regime forces and ISIS for the second day in the Kwaires military air base, the last stronghold of regime forces in northern Syria.
ISIS killed 12 officers of regime during the attack on the airport, 40 km east of Aleppo province. The Kwaires airport, besieged by ISIS forces, has been under mutual shellings overnight in addition to aerial bombardment by regime warplanes.
The mutual shellings were accompanied by a sound of explosion in the area caused by targeting with booby-trapped vehicle by ISIS on the airbase, the SOHR said.
The Observatory, a UK-based group that reports on the war using sources on the ground, said that at least 15 regime troops, and 26 ISIS militants were killed in the attacks.
Meanwhile, fierce clashes took place on Tuesday between the Syrian opposition troops and ISIS in the northern countryside of Aleppo province in around the town of Marea. ISIS suicide attackers had detonated four car bombs overnight in Marea, 20 kilometres south of the Turkish-Syrian borderline. The observatory said at least 25 rebels and eight ISIS fighters were killed in Marea.
ISIS had captured the Syrian Province of Raqqa, declaring it the capital of their self-proclaimed “caliphate” in June 2014 after seizing swathes of territory in Syria and Iraq. A US-led coalition started air strikes in Syria and Iraq against ISIS targets last September.
The war in Syria started in 2011 in the form of anti-government demonstrations, but descended into a civil war between five main factions - the regime, the opposition, Al Qaeda-affiliated Nusra Front, ISIS, and the Kurdish People's Protection Units (YPG) militia.
Over four years of fighting has left more than 230,000 Syrians dead, according to UN estimates. More than 6.7 million are displaced internally while at least 5 million have fled to the neighbouring countries of Turkey, Lebanon, Egypt and Jordan.