At least 11 people were killed and two were injured in a suicide bombing attack in northern Syria, an opposition source told EFE on Tuesday.

Manbij Military Council spokesman Shervan Derwish said that two Islamic State suicide bombers detonated their explosive belts early on Tuesday in the town of Al-Mashi, near the strategic city of Manbij, located 100 kilometers (62 miles) to the northeast of Aleppo.

He added that the injured were taken to hospitals in Al-Qameshli, a majority-Kurdish town in the northeastern city of Al-Hasaka, 300 kilometers (186 miles) to the east of Manbij.

Derwish said that at the time of the attack a local tribal leader, Mohammed Jair al-Mashi, was visiting his hometown.

He is the son of the late member of the Syrian Parliament Diab al-Mashi (1915-2009), who served as a deputy in the People's Council for a record 55 years.

The town is under the control of the Syrian Democratic Forces (SDF), an armed Arab-Kurdish coalition that liberated Al-Mashi from the IS in August.

The IS has launched an offensive against the region in the past few hours, with clashes underway in the Dandania area near Manbij, where three IS car bombs recently exploded.