Indian National Disaster Response Force (NDRF) personnel prepare to be flown to Nepal to provide assistance follwoing an earthquake at the Netaji Subhash Chandra Bose International Airport in Kolkata on April 27, 2015. Tens of thousands of frightened Nepalese huddled in tents desperate for help April 27, 2015, two days after a quake killed more than 3,500 people, as international rescue teams with sniffer dogs raced to find survivors buried in the rubble. Teams equipped with heavy cutting gear and relief supplies were landing round the clock at the only international airport on the outskirts of Kathmandu, which has been devastated by Saturday’s 7.8 magnitude quake. AFP PHOTO/ Dibyangshu SARKAR (Photo credit should read DIBYANGSHU SARKAR/AFP via Getty Images)