The head of the rebel-run border crossing in the same area said separately that air strikes hit a garage for commercial trailers, killing three people.
"Our teams helped to extinguish the fire... The trucks do not belong to us and there is no information on who bombed them," Mustafa Özbek, an İstanbul-based official from the Humanitarian Relief Foundation (İHH), told Reuters.
The aid worker who filmed the aftermath initially said it appeared aid trucks had been targeted.
It was not immediately clear if the strikes were carried out by Russian or Syrian warplanes.
The Syrian Observatory for Human Rights reported earlier intensive Russian airstrikes in Azaz.
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