The Taliban has claimed responsibility the assassination of at least 141 people at a school run by the military in Pakistan's Northwest frontier. Secretary of State John Kerry decried the atrocity, "The images are absolutely gut-wrenching – young children, carried away in ambulances, a teacher burned alive, in front of her students. A house of learning turned into a house of unspeakable horror. Prime Minister Sharif said, ‘These are my children, this is my loss.' Well this morning, wherever you are, wherever you live, those are our children." Saeed Shah, Pakistan correspondent for the Wall Street Journal, joins us from Islamabad.