An air strike on a high school has killed 16 people, most of them students and teachers, in a rebel-held city in northern Syria, a monitoring group says.
"The Syrian air force bombed a technical high school in the city of Raqa, killing 16 people, among them 10 students aged under 18, and wounding many others, some critically," said the Syrian Observatory for Human Rights on Sunday, updating an earlier toll.
The Britain-based group posted video footage showing mangled bodies, one lying under schoolbooks. Its authenticity could not immediately be verified.
"There was panic, with children crying as they sought to take shelter," the Observatory quoted a survivor as saying.
Raqa, on the Euphrates River valley 160 kilometres east of the main northern city of Aleppo, is the only provincial capital entirely in rebel hands.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
Captured from government forces on March 6, the city is now largely controlled by Al-Qaeda loyalists of the Islamic State of Iraq and the Levant.
The air strike came after rebels launched an overnight attack on army positions in Nasseriya al-Qalamun, north of Damascus, killing at least 19 soldiers and wounding 60, the Observatory said.
"There were also losses in the ranks of the rebels, who succeeded in capturing several positions," it added, without giving a figure.
