Indian school children make a human chain as they pay tribute to Pakistan children and staff killed in a Taliban attack on a school in Peshawar, in New Delhi on December 18, 2014. Pakistan began three days of mourning on December 17 for the 132 schoolchildren and nine staff killed by the Taliban in the country's deadliest ever terror attack as the world united in a chorus of revulsion. AFP PHOTO / PRAKASH SINGH (Photo credit should read PRAKASH SINGH/AFP/Getty Images)