Syrian activists and rescue workers in the rebel-held part of the contested city of Aleppo said that government warplanes dropped suspected chlorine bombs Tuesday on a crowded neighborhood, injuring dozens.

The report could not be independently verified and it was not clear how it was determined that chlorine gas was released.

Accusations involving use of chlorine and other poisonous gases are not uncommon in Syria’s civil war, and both sides have denied using them while blaming the other for using it as a weapon of war. Last month, there were at least two reports of suspected chlorine attacks in Aleppo also, while the Syrian government also blamed the opposition for using the gas.

In Tuesday’s attack, a medical report from one of the hospitals in the besieged eastern rebel-held part of Aleppo was shared with journalists via text messages. It said at least 71 persons, including 37 children and 10 women, were treated for breathing difficulties, dry cough, and that their clothes smelled of chlorine. The report said 10 of the patients are in critical care, including a pregnant woman.

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