BBC: Syria war: Aleppo 'gas attack' sparks Russia strikes
Russia has carried out air strikes against Syrian rebels it accuses of launching a chemical attack on the government-held city of Aleppo.
Both Syria and its Russian allies say shells carrying toxic gas injured about 100 people late on Saturday.
State media showed images of Aleppo residents being treated in hospital as they struggled to breathe.
The rebels deny carrying out a chemical strike and say the claims are a pretext for an attack on opposition-held areas.
Parts of the Aleppo region, as well as the neighbouring provinces of Hama and Idlib, are controlled by Turkish-backed rebels and jihadists.
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More News On Reports Of A Gas Attack On The Syrian City Of Aleppo
Russian Warplanes Strike Rebels After Alleged Gas Attack -- Bloomberg
Russia bombs militants after Aleppo 'chlorine' attack -- DW
Russian Air Force hits positions of Syrian militants used for Aleppo 'gas attack' -- RT
Dozens injured in toxic gas attack on Aleppo, Syria, reports say -- CNN
Scores poisoned in Aleppo gas attack, Syria and Russia blame rebels -- Reuters
Russia blames Syrian Islamist extremists for chlorine gas attack on Aleppo which poisoned 46 including eight children -- Daily Mail
Syria: Opposition denies launching poison gas attack on Aleppo -- Al Jazeera
Critics sceptical of Syrian government allegations of Aleppo chemical attack -- Middle East Eye
