Yasser Yusef, a senior official of the Nureddine al-Zinki group, told AFP that the attack in the town of Azaz "bore the hallmarks" of the Islamic State jihadist group.
"The attack left 25 dead among our fighters and civilians," said Yusef, whose group, which itself is Islamist, distributed pictures to journalists of the victims in body bags.
The Syrian Observatory of Human Rights, a Britain-based monitoring group, said the bombing targeted an arms depot of Nureddine al-Zinki, killing 10 fighters and wounding dozens of other people.
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