Islamabad: The US has confirmed the killing of the mastermind behind the December 2014 carnage at Peshawar's Army Public School in a drone strike in Afghanistan, Pakistani officials said.

A statement issued by the Inter-Services Public Relations said that the US Commander of the Resolute Support Mission General John Nicholson called Chief of Army Staff General Raheel Sharif on Wednesday and confirmed the death of terrorist Umar Mansour in Afghanistan.