US representative Dennis Kucinich urged the UN and the International Criminal Court on Tuesday to look into Nato war crimes in Afghanistan and Libya and to "pursue prosecution where warranted."
The progressive Ohio Democrat wrote to ICC prosecutor Luis Moreno-Ocampo and UN secretary-general Ban Ki Moon, saying that Nato's drone strikes needed particular attention.
He pointed to a report by the New America Foundation which found that the remote-controlled bombers have a civilian casualty rate as high as 32 per cent.
"It is imperative that Nato and its commanders are held directly accountable under international criminal statutes for actions which place the lives of innocent civilians at risk," he wrote.
"If the UN is to continue to be a credible interlocutor among nations, it has no choice but to conduct an independent investigation of actions taken by Nato and to pursue prosecution where warranted."