Nepalis started fleeing their devastated capital of Kathmandu on April 27 after Saturday's earthquake killed more than 3,700 people and toppled entire city blocks. The United Nations has launched a massive aid operation, but severed communications and landslides in the Himalayan nation pose formidable challenges. Residents of Kathmandu are in need of almost everything - shelter, fuel, food, medicine, power, news, workers, and more.