Syrian government troops and rebels are locked in fierce fighting across several districts of the country's second city Aleppo, the Syrian Observatory for Human Rights said on Friday.
"Violent clashes are taking place in the Salaheddin, Azimiyeh, Akramiyeh and Ard el-Sabbagh neighbourhoods between the regular army and the rebels," the watchdog said, reporting "casualties" without further details.
The Britain-based Observatory said the clashes began on Thursday night.
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