People wait to board buses to leave devastated Kathmandu, capital of Nepal, in the hope of reaching the border with India, April 29. [Photo/IC]

A 7.8 magnitude quake rocked the impoverished nation on Saturday, toppling thousands of buildings in the densely-populated Kathmandu Valley, where the capital is located.

More than 5,000 people were killed and at least 10,194 people injured in the Himalayan country's worst earthquake in more than 80 years, and the many aftershocks that followed.

The United Nations estimates that eight million people have been affected, with at least two million in need of tents, water, food and medicines over the next three months.