The United Nations has said intensified air strikes by the US backed forces on Islamic State group's stronghold Raqqa in Syria are causing an overwhelming loss of civilian life.

Chairman of the UN Commission of Inquiry on War Crimes, Paulo Pinheiro told the  Human Rights Council in Geneva that intensification of air strikes in Raqqa has resulted not only in staggering loss of civilian life, but also led to one hundred sixty thousand people fleeing their homes and becoming internally displaced.

Meanwhile, Human Rights Watch has also expressed concern about the use of incendiary white phosphorous weapons by the US-led coalition fighting Islamic State in Iraq and Syria.

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