Nearly all warring parties in Syria - the regime, rebels, jihadists, and Kurds - have carved out zones of control in the war-torn northern province.
According to the Syrian Observatory for Human Rights, six civilians were killed and eight wounded in regime air strikes on rebel-held eastern parts of Aleppo city yesterday.
Opposition groups fired rockets into the government-controlled western districts, leaving five people dead and 20 wounded, the Observatory added.
"This escalation directly threatens the truce."
Brokered by Russia and the United States, the cessation of hostilities deal does not include the fight against the Islamic State group or Al-Qaeda's local Syrian affiliate.
The truce had largely held across parts of Syria since late February, despite frequent accusations that both sides were committing breaches.
But violence around Aleppo has sparked concerns that the ceasefire may not last, partly because rebels are involved in the battles there too.
The jihadist onslaught has forced 30,000 Syrians to flee, and tens of thousands more are at risk of displacement.
Since the Syrian conflict erupted in 2011, half of the country's population has been displaced - including five million who have fled to neighbouring states.
More than 270,000 people have been killed.
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