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Doctors treat Syrians suffering from breathing difficulties at a make-shift hospital in Aleppo after regime helicopters dropped barrel bombs on the rebel-held Sukkari neighbourhood of the northern Syrian city on September 6, 2016. 
The Britain-based Syrian Observatory for Human Rights said the bombs hit the Sukkari neighbourhood and that more than 70 people "most of them civilians" were treated for choking symptoms.  / AFP / THAER MOHAMMED        (Photo credit should read THAER MOHAMMED/AFP/Getty Images)
Doctors treat Syrians suffering from breathing difficulties at a make-shift hospital in Aleppo after regime helicopters dropped barrel bombs on the rebel-held Sukkari neighbourhood of the northern Syrian city on September 6, 2016. 
The Britain-based Syrian Observatory for Human Rights said the bombs hit the Sukkari neighbourhood and that more than 70 people "most of them civilians" were treated for choking symptoms.  / AFP / THAER MOHAMMED        (Photo credit should read THAER MOHAMMED/AFP/Getty Images)

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Más de 80 personas sufren dificultades respiratorias graves en la ciudad asediada de Siria, Aleppo, tras otro ataque químico en un barrio controlado por los rebeldes, dijo el secretario de Defensa Civil, un grupo de voluntarios rescatistas

Niños se quedan sin aire después ataque con gas en Aleppo

Más de 80 personas sufren dificultades respiratorias graves en la ciudad asediada de Siria, Aleppo, tras otro ataque químico en un barrio controlado por los rebeldes, dijo el secretario de Defensa Civil, un grupo de voluntarios rescatistas