Intense air raids shook Syria's Aleppo today as increasing tensions between Moscow and Washington poisoned efforts to revive a failed ceasefire.
The UN Security Council was due to meet later for talks on salvaging the truce -- which collapsed on Monday after only a week -- but the mood was likely to be tense after the United States said it held Russia responsible for a deadly air strike on an aid convoy.
US Secretary of State John Kerry and Russian Foreign Minister Sergei Lavrov are both to address the council, ahead of more talks expected later this week.
Russia and the United States co-sponsored the ceasefire plan, with Kerry warning it could be the "last chance" to try to end Syria's civil war, which has killed more than 300,000 people in five years.
In Aleppo, a key battleground in the conflict, bombardment pummelled opposition-held districts and the city's outskirts into this morning.
The Syrian Observatory for Human Rights monitoring group said dozens of raids hit the city's east overnight, as regime troops advanced on rebels in Aleppo's southwestern outskirts.
It was a sleepless night for many Aleppo residents, AFP's correspondent in the city said, with the bombardment continuing until rain broke out over the city at dawn.
In the rebel-held neighbourhood of Sukkari, Abu Ahmad cleared rubble and shattered glass from his doorstep after bombardment demolished the six-storey building next door, killing his neighbours.
Syrian state media reported the city's government-held west had come under rebel shelling, which killed two people.
A medical aid group said four of its doctors were killed and a nurse critically wounded when an air strike hit a clinic in a village near Aleppo late yesterday.
The Union of Syrian Medical Relief Organisations (UOSSM) said the clinic in the village of Khan Tuman was completely levelled in the 11:00 pm (local time) strike and more dead were feared to be buried under the rubble, the group added.
The Britain-based Observatory said nine medical staff affiliated with the Army of Conquest rebel alliance were also killed while working in the clinic.
According to the World Heath Organisation, Syria is the most dangerous country in the world for health professionals, with 135 strikes on clinics and hospitals last year.
Monday's strike on the aid convoy near Aleppo killed 20 civilians and destroyed 18 trucks, the Red Cross said, and prompted the UN to suspend all humanitarian convoys across Syria.
"There only could have been two entities responsible, either the Syrian regime or the Russian government," President Barack Obama's national security spokesman Ben Rhodes said. "In any event, we hold the Russian government responsible for air strikes in this space."
Two Russian SU-24 ground attack jets were operating in the area where the aid convoy was struck, another US official told AFP. "The best evaluation we have is that the Russians carried out the strike," he added, speaking on condition of anonymity.
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