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At least 18 people, 10 of them children, were killed when Syrian government bombs hit a school in the northern city of Aleppo on Wednesday, according to a Syrian rights group.

The Britain-based Syrian Observatory for Human Rights, which relies on a network of on-the-ground volunteers, said it had identified by name all of those killed in the air raid on Ein Jalout school in the Ansari Sharqi neighborhood of Aleppo.

A young Syrian girl lays in a makeshift hospital bed after she was wounded in a reported air strike by government forces that hit the Ein Jalout school in Aleppo, Syria, on Wednesday. ZEIN AL-RIFAI / AFP - Getty Images

Journalists are not able to work freely throughout Syria because of the ongoing civil war, and NBC News could not independently confirm the reports.

The United Nation’s Children’s rights and relief organization, UNICEF, condemned a series of attacks on Syrian civilians Wednesday.

“UNICEF is outraged by the latest wave of indiscriminate attacks perpetrated against schools and other civilian targets across Syria which left dozens of children killed and injured,” it said in a statement issued Wednesday.

Aleppo has been under siege by forces loyal to President Bashar Assad, who is thought to have gained the upper hand in the three-year civil war pitting him against the largely Sunni Muslim rebels.

-- Charlene Gubash and F. Brinley Bruton