Britain has accused Russia and Syria of war crimes during a special meeting of the UN Security Council in New York to discuss the crisis in Aleppo.

Russian and Syrian jets have been accused of using phosphorous and cluster munitions on civilian areas.

Also, the regime has been targeting emergency workers responding to attacks with barrel bombs.

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Russian and Syrian aircraft bombed areas of eastern Aleppo killing 100 people since Thursday

At least 17 children have been killed since the major offensive began on Thursday

Rebel commanders claim Russian and Syrian jets have been using phosphorous munitions

The British ambassador to the UN said Russia is partnering with Syria to commit war crimes.

US ambassador Samantha Power accused the Russians of 'barbarism' during the high-powered discussion in New York earlier today.

The US has accused Russia of 'barbarism' as a result of Moscow's bombing campaign in the besieged Syrian city of Aleppo.

The US Ambassador to the United Nations Samantha Power slammed Russia and Syria over the campaign to push out rebels from the city due to the high level of civilian deaths caused by the campaign.

Ms Power said the Russian campaign in support of Bashar al-Assad was not counter-terrorism, but 'barbarism'.

The UN Security Council met in New York today to discuss the crisis.

The United Nations special envoy on Syria Staffan de Mistura told the same meeting he was convinced the situation in Syria could still be turned and said he would not quit, as Russia and the United States try to salvage a ceasefire.

French UN Ambassador Francios Delattre said: 'War crimes are being committed here in Aleppo. They must not be unpunished and impunity is simply not an option in Syria.'

Russian and Syrian jets dropped banned phosphorous and bombs on a rebel camp on the outskirts of Aleppo killing at least 100 civilians, including 17 children.

Bombers pounded rebel-held areas in eastern Aleppo including a Palestinian refugee camp on the outskirts of the city.

The camp, which overlooks the north of the city was captured briefly by Syrian troops, who were later driven out. Rebels claim Russian and regime jets then bombed the camp with phosphorous munitions, which are not supposed to be used on civilian populations.

The Russians have launched a 'shock and awe' campaign against the Syrian rebels

Some 250,000 people are trapped in Aleppo which is under siege by Syrian troops

The Handrat camp has been in rebel hands for a couple of years.

Rebel commander Abu al-Hassanien said: 'We retook the camp, but the regime burnt it with phosphorous bombs ... We were able to protect it, but the bombing burnt our vehicles.'

According to the regime: 'The Syrian army is targeting the armed groups positions in Handarat camp.'

The army announced on Thursday the start of a major new military campaign to regain Aleppo, intensifying strikes and use of powerful weapons that rebels said was an 'shock and awe' campaign aimed at creating devastation and demoralising them.

Russian planes also continued their pounding of residential parts of Aleppo, with whole buildings flattened, according to rebels and residents.

The assault on Aleppo, where more than 250,000 civilians are trapped, could be the biggest battle yet in a civil war that has killed hundreds of thousands of people and driven 11 million from their homes.

Two weeks after Moscow and Washington announced a ceasefire that quickly unraveled, President Bashar al-Assad and his Russian and Iranian allies appear to have launched a campaign for a decisive battlefield victory that has buried any hope for diplomacy.

The UN Security Council is due to meet later today in an emergency session to discuss the escalating violence, which UN chief Ban Ki-moon described as 'chilling'.

Washington and its European allies meanwhile said the burden was on regime ally Moscow to save a truce that fell apart in the past week.

The United Nations is set to discuss the situation in Syria during a meeting in New York today

At least 101 people, mostly civilians, have been killed in Syrian and Russian bombardment of eastern Aleppo since the army announced an operation to take it Thursday, the Syrian Observatory for Human Rights said.

The monitor said at least 17 children were among those killed in the assault, which has included missile strikes, barrel bomb attacks and artillery fire.

On Saturday night, residents said cluster bombs rained down on eastern parts of the city, where an estimated 250,000 people are living under a government siege.

'All night long they were dropping cluster bombs. I couldn't sleep until four in the morning,' said 62-year-old Ahmed Hajar, who was out looking for bread in Al-Kalasseh neighbourhood.

'Today the streets of my neighbourhood are full of unexploded cluster bombs. One person was killed when he disturbed one and it exploded,' he added.

'It tore him apart... it was an awful scene.'

In the nearby neighbourhood of Bab al-Nayrab, 30-year-old Imad Habush was baking bread in a small wood-burning oven outside his house.

'None of the bakeries are open anymore because of the bombing and the shortages of fuel and flour, so people have started making their own bread,' he said.

'I don't know why the regime is bombing us in this barbaric way. We're civilians here, we're not carrying weapons, and we're besieged, we have no way to escape.'

Syrian troops are engaged in a battle to retake the city with the assistance of Russian airpower

Once Syria's economic powerhouse, Aleppo has been ravaged by war and roughly divided since mid-2012 between government control in the west and rebel control in the east.

The eastern portion of the city has been under near-continuous siege since mid-July, prompting food and fuel shortages.

A truce deal hammered out by Russia and the United States this month was meant to see aid trucked into the east of the city.

But the ceasefire fell apart before any assistance was brought in, and the army and its Russian ally have since pounded the eastern neighbourhoods with a force that residents say is virtually unprecedented.

More than 300,000 people have been killed and over half the country displaced since the war began in March 2011 with anti-government protests.

Successive attempts to reach a political solution have failed, and the latest bid by Moscow and Washington has virtually collapsed, despite ongoing talks to save it.

Ban said Saturday he was 'appalled by the chilling military escalation' in Aleppo, and Britain, France and the United States requested an emergency meeting of the UN Security Council.

The meeting is scheduled for 3pm, but it was unclear what results it could produce, with Moscow and Washington trading accusations over who is to blame for the ceasefire's failure.

The United States and its European allies said Saturday it was up to Moscow to save the truce.

'The burden is on Russia to prove it is willing and able to take extraordinary steps to salvage diplomatic efforts,' read a joint statement from Britain, France, Germany, Italy, the United States and European Union.

'Patience with Russia's continued inability or unwillingness to adhere to its commitments is not unlimited,' the statement added.

But Russia has blamed Washington for the ceasefire's failure, saying it did not uphold its commitment to ensure moderate rebels distanced themselves from jihadist groups like former Al-Qaeda affiliate Al-Nusra Front.

Syria's foreign minister meanwhile said Saturday that his government was confident of 'victory' with support from 'true friends' including Russia, Iran, and Lebanon's Shiite militant group Hezbollah.

'Our belief in victory is even greater now that the Syrian Arab army is making great strides in its war against terrorism,' he told the UN General Assembly.