Late Saturday, state media accused rebels of launching an attack with "toxic gas" on the northern city in what health official Ziad Hajj Taha said was a "probable" chlorine attack.

On Saturday, an AFP photographer saw men, women and children being treated at an Aleppo hospital for breathing difficulties. Some were sitting, while others lay down, breathing through with oxygen masks. The regime controls Aleppo, but rebels and jihadists are present in Idlib.

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But a rebel coalition there on Sunday denied involvement, "We at the National Liberation Front deny the criminal, lying regime's allegations that revolutionaries targeted the city of Aleppo with any missiles and especially not any containing chlorine gas." Other groups in the area include the jihadist-dominated Hayat Tahrir al-Sham alliance and the Al-Qaeda-linked Hurras al-Deen group, neither of whom have commented.

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