Beirut: Syrian forces repelled an attack by the Islamic State group on a major air base in the country's east on Saturday, in fighting that killed dozens on both sides, activists and state media said.
The base, outside the city of Deir el-Zour, has been used by the government in the past months to launch air raids on areas held by the Islamic State group bordering Iraq.
The Islamic State group is trying to capture the air base and a nearby barracks known as Brigade 137 to eliminate the main pocket of resistance in the area and provide a major morale and propaganda boost after a string of setbacks in recent weeks.
The Britain-based Syrian Observatory for Human Rights said the latest attack began with a suicide car bomb at the main entrance of the Deir el-Zour air base. The rebels stormed parts of the base before a counterattack and intense air raids by government forces pushed them back, it added.
The group said that some Islamic State fighters had breathing problems in the area after government forces used chlorine gas against them.
Syrian state TV quoted an unnamed military official as saying that troops repelled attempts by "terrorists" on several areas near the city of Deir el-Zour and killed "tens of them and destroyed their vehicles and weapons."
The station later aired footage of Syrian troops standing near bodies of dead fighters it said were Islamic State group members who were killed in Deir el-Zour.
The Islamic State group began a major offensive on the air base, one of the last government-held areas in the province of Deir el-Zour, on Thursday.
The Observatory said that since Thursday, more than 150 fighters on both sides have been killed, including 51 troops and pro-government militiamen. It said at least 100 Islamic State group fighters have been killed, including two French citizens.
Activists who support the Islamic State group posted photos on social media showing two military helicopters that they claimed were captured by the jihadis.
Earlier today, state news agency SANA said the government's air force was taking part in the operations at the air base, adding that they destroyed an Islamic State group convoy consisting of five armored vehicles and four pickup trucks mounted with heavy machine guns.
On Friday, Islamic State group fighters captured the strategic village of Jafra near the air base. If jihadis capture the air base and Brigade 137, they could threaten government-held areas in the provincial capital of Deir el-Zour.