BEIRUT Attacks by government forces and rebels killed at least 30 people, including eight children, in the last 24 hours in Aleppo, a city seeing some of the worst of a renewed escalation in the Syrian war, a monitoring group said.
Intensified fighting has all but destroyed a partial ceasefire that started at the end of February, with U.N.-led peace talks in disarray.
In Aleppo, divided between areas controlled by the government and by rebels, 19 people were killed by rebel shelling and 11 were killed by government air strikes, the Syrian Observatory for Human Rights said.
That adds to another 60 people killed over the weekend in Aleppo, Syria's largest city before the war, according to the Observatory. Air strikes were also reported in rebel-held areas near Damascus and in Hama province on Tuesday.
In a separate incident west of Aleppo, five Civil Defence workers - first responders in opposition-held territory where medical infrastructure has all but broken down - were killed by air strikes and a rocket attack on their centre.
The Observatory and Civil Defence colleagues said the attack appeared to have deliberately targeted the rescue workers in the town of Atareb, some 25 km (15 miles) west of Aleppo.
"The targeting was very precise," Radi Saad, a Civil Defence worker, told Reuters.
"They were in the centre and ready to respond. When they heard warplanes in the area they did not think they would be the target." Two people were seriously wounded and ambulances and cars belonging to doctors were destroyed, another Civil Defence member, Ahmad Sheikho, said.
It was unclear whether Syrian or Russian warplanes had launched the raids. There was no immediate comment from the Syrian government.
Each side accuses the other of targeting civilian areas in the five-year-old war that has killed more than 250,000 people.
A Syrian military source said the army would "respond firmly" against rebels attacking government-held parts of Aleppo. State news agency SANA said what it called terrorist groups, including the al Qaeda-affiliated Nusra Front, had shelled those neighbourhoods.
In the north of Aleppo, insurgents resumed bombardment of a Kurdish-controlled neighbourhood, Sheikh Maqsoud, according to the Kurdish YPG militia.
"Civilian areas were shelled at random," the YPG said.
The YPG and its allies have been battling rebels, including groups backed via Turkey by states opposed to President Bashar al-Assad, for several months near Aleppo and close to the Turkish border.
Rebels accuse the YPG of collaborating with the government in trying to stop people using the only road into opposition-held Aleppo, something the YPG denies.
Turkey sees the YPG as a terrorist group and is concerned at moves by Kurdish forces to expand their control along the Syrian-Turkish border, where they already hold an uninterrupted 400 km (250 mile) stretch.
(Reporting by John Davison; additional reporting by Tom Perry and Marwan Makdesi in Damascus; Editing by Robin Pomeroy)
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