Syrian opposition activists say an explosive device detonated in a northern town held by Turkey-backed opposition fighters killing four people, including two children.
The Britain-based Syrian Observatory for Human Rights said Saturday's car bomb went off at entrance of the industrial district of the town of Azaz.
It added that the explosion occurred near a tanker filled with fuel, causing a fire.
The Aleppo Media Center, an activist collective, also reported four people killed including two children, adding that the explosion occurred inside a shop that sells fuel.
Car bombs have been common since Syria's conflict began in 2011.
Northern Syria has been fraught with clashes between rival insurgent groups including al-Qaida-linked militants and Turkey-backed rebels.
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