A medical group has warned that the health system in Aleppo is on the verge of collapse, as Syrian Government forces backed by Russia continue an intensive bombing campaign.

Key points: Medics say there are only eight hospitals, 30 doctors left in Aleppo

Medics say there are only eight hospitals, 30 doctors left in Aleppo Russia spars with US, UK and France at emergency UN meeting

Russia spars with US, UK and France at emergency UN meeting Rights group calls on all parties to immediately allow unconditional humanitarian access

The Syrian American Medical Society says hospitals in the city's besieged east are overwhelmed by the number of casualties.

"There is a shortage of all medical supply inside the city, in terms of emergency medicines, and surgical consumables, and especially orthopaedic consumables," Abd Arrahman Alomar, the society's coordinator, said at a press conference in Geneva.

"Most of cases are trauma cases, many of them need fixations, external fixators are absent at all inside the city.

"If this continues, we are going to the point of zero, where there is no facilities to be protected, where there are no health staff to be protected also."

Dr Alomar says there are only eight hospitals and 30 doctors left in the city's east, where an estimated quarter of a million people are trapped with dwindling supplies of food, medicines and fuel.

One obstetrician and two paediatricians remain to treat pregnant women and children.

More than 320 people have reportedly been killed since regime forces resumed their bombardment after last week's short-lived ceasefire failed.

'Over 90 per cent of attacks carried out by Syrian Government'

The non-government organisation Physicians for Human Rights, whose reports are used by the UN Security Council, says it has no doubt who is behind the latest bombings.

"We can state without a doubt that over 90 per cent of the attacks Physicians for Human Rights has documented were carried out by Syrian Government forces or their allied Russian forces," said Elise Baker, the organisation's Syria research coordinator.

"To be clear, opposition and Islamic State forces have also attacked medical facilities, those attacks are equally abhorrent, but they in no way match the scope and scale of the Syrian Government's all out assault on its own people and their health infrastructure."

A pro-opposition media group posted footage on Monday which purported to show the aftermath of incendiary bombs in the Bab al-Nairab district of Aleppo.

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Qasioun News said the video showed the smoking remains of a phosphorus bomb — a nearby building was ablaze, and rescue workers were frantically searching for survivors.

"The area here is filled with civilians. There are no militants or terrorists. They have attacked here with phosphorous and rockets. With thermo-baric rockets. Women and children are being killed," said one volunteer.

"This building is filled with civilians. It's filled with families. Where is all of humanity? Where is Islam? They are hitting us with phosphorous and all of us here are civilians."

Russia spars with West at emergency UN session

During an emergency session of the UN Security Council, US ambassador Samantha Power accused Russia of "barbarism" — Britain and France went further, accusing Moscow of war crimes.

But the Kremlin hit back.

US ambassador to the UN Samantha Power addressing the emergency meeting. ( AFP: Bryan R. Smith, file )

Spokesman Dmitry Peskov denounced "the overall unacceptable tone and rhetoric of the representatives of the United Kingdom and the United States, which can damage and harm our relations", while Moscow says the comments threaten efforts to reach a new ceasefire.

Syria's Foreign Walid al-Moualem blames the US for the ceasefire's collapse.

"The groups that claim to be moderate, and there are about 20 of them in Aleppo, announced they would not be adhering to the truce agreement and they carried out about 300 violations of the truce deal and there were civilian victims and military," he said.

"The Syrian army was the only side respecting the truce deal.

"And the attack on the al-Tharda position is an example of how the US was not upholding its side of the agreement," he added, referring to the recent attack by US led forces on a Syrian government military base in Syria's east.

'We want to start a normal life again'

As the war intensifies in Aleppo, humanitarian agencies have managed to deliver aid to four towns that have been under siege since April, two near Damascus and two in the western Idlib province.

Madaya and Zabadani, near Damascus, are encircled by Government forces, while Fuaa and Kafraya in the north-west are besieged by hardline rebels.

But the World Food Program's (WFP) country director in Syria Jakob Kern said residents had been burning carpet and furniture to stay warm.

"When I asked what do you want to convey to the world, [they said]: 'We want the siege lifted, we want to start a normal life again'," he said.

Mr Kern called on all parties to the conflict to immediately open transport routes to allow unconditional, unimpeded, sustained and safe humanitarian access to those in Aleppo and other parts of Syria that need support.