A powerful magnitude 6.7 aftershock shook the Kathmandu region of Nepal sending people yelling and running Sunday, a day after a massive earthquake crippled the region killing more than 2,200.
The U.S. Geological Survey said the aftershock registered at a shallow depth of six miles.
"The aftershocks keep coming ... so people don't know what to expect," said Sanjay Karki, Nepal country head for global aid agency Mercy Corps. "All the open spaces in Kathmandu are packed with people who are camping outdoors. When the aftershocks come you cannot imagine the fear. You can hear women and children crying."
With people fearing more quakes, tens of thousands of Nepalese spent Saturday night outside under chilly skies, or in cars and public buses. They were jolted awake by the aftershocks Sunday.
Saturday's magnitude 7.8 earthquake spread horror from Kathmandu to small villages and to the slopes of Mount Everest, triggering an avalanche that buried part of the base camp packed with foreign climbers preparing to make their summit attempts. At least 17 people died there and 61 were injured.
The earthquake centered outside Kathmandu, the capital, was the worst to hit the South Asian nation in over 80 years. It destroyed swaths of the oldest neighborhoods of Kathmandu, and was strong enough to be felt all across parts of India, Bangladesh, China's region of Tibet and Pakistan.
By Sunday afternoon, authorities said at least 2,169 people had died in Nepal alone, with 61 more deaths in India and a few in other neighboring countries. At least 721 of the deaths were in Kathmandu, and the number of injured nationwide was upward of 5,000. With search and rescue efforts far from over, it was unclear how much the death toll would rise.
The State Department confirmed Sunday that three U.S. citizens died in Nepal Saturday.
Dan Fredinburg, a Google executive who described himself as an adventurer, was among the dead.
Google confirmed his death. Lawrence You, the company's director of privacy, posted online that Fredinburg was in Nepal with three other Google employees climbing Mount Everest. The other three, he added, are safe.
According to the technology blog Re/Code, Fredinburg was an experienced climber who co-founded, in his spare time, Google Adventure. The project aims to "translate the Google Street View concept into extreme, exotic locations like the summit of Mount Everest or the Great Barrier Reef off Australia," according to Startup Grind, a global startup community.
Outside of the oldest neighborhoods, many in Kathmandu were surprised by how few modern structures collapsed in the quake. The city is largely a collection of small, poorly constructed brick apartment buildings.
While aid workers cautioned that many buildings could have sustained serious structural damage, it was also clear that the death toll would have been far higher had more buildings caved in.
But aid workers warned that the situation could be far worse near the epicenter. The U.S. Geological Survey said the quake was centered near Lamjung, about 50 miles northwest of Kathmandu, in the Gorkha district.
Roads to that area were blocked by landslides, hindering rescue teams, said chief district official Prakash Subedi. Teams were trekking through mountain trails to reach remote villages, and helicopters would also be deployed, he said by telephone.