Rockets fired by insurgents have hit a hospital in a government-held part of Aleppo city, causing dozens of casualties, the Syrian Observatory for Human Rights said.
The Observatory did not say how many people had been killed in the strike on the al-Dabit hospital.
State-run Syrian news channel Ikhbariya said three women were killed and 17 more people wounded.
The Syrian army said in a statement the attack was part of a widespread assault by insurgent groups in Aleppo on Tuesday and that it was responding "to the sources of fire".
The statement issued by the army command said the attack was at "a time when international and local efforts are being made to shore-up the (cessation of hostilities agreement) and to implement ... calm in Aleppo".
The Observatory said the hospital had been heavily damaged.
In rebel-held parts of Aleppo, the Observatory said there had been three air strikes, citing information of an unconfirmed number of people killed.
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