Syrian state forces have faced fresh accusations of war crimes after they bombarded civilians with 'thermite bombs'.

Women and children were among those who suffered deep burns in a fresh assault on the rebel-held stronghold of Idlib.

Thermite is said to be the hottest burning substance in the world - burning at temperatures of 2,500C.

Opposition fighters in the area had been celebrating only hours earlier after breaking a siege in the neighbouring city of Aleppo where civilians had faced starvation and dwindling medical supplies.

But their joy was short-lived as the state and its Russian allies hit back after the rebels' win by raining down blasts in the region.

On Sunday night the blasts in Idlib lit up the sky with an eerie white glow which aid workers and opposition figures say points to the use of substances illegal under the Geneva Convention.

A woman and two children were among those to have suffered "deep, deep burns" in the attack, according to emergency workers in the area.

Syrian government forces released cockpit videos showing some of the attacks on rebel positions.

But the repeated targeting of civilian areas and the alleged use of banned weapons have led to fresh accusations of war crimes.

There are calls for the UN to take action at a special hearing on Aleppo taking place in New York tonight.

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