One of the strongest earthquakes in history struck Nepal early Saturday, resulting in the deaths of over 800 people, authorized said.

The quake's tremors hit a 7.8-magnitude in an area between cities, capital Kathmandu and Pokhara, the US Geological Survey said. The tremors were also felt in neighboring India Bangladesh, where casualties were also reported, according to CNN.

The death toll is still rising, as several people are still believed stuck in the rubble around the city, reported BBC.

Nepal's Ministry of Home Affairs reported that the number of people killed from the disaster could still climb as the rescue operations continue.

CNN's Manesh Shrestha said in a report that as he sought treatment from the hospital for his injuries, he was turned down. He added that hospital personnel saw other people in more urgent need than him, and that the capital of Kathmandu where he is staying is "quite chaotic."

At least 15 aftershocks were felt after the earthquake struck. The historic landmark Dharahara tower was destroyed, and many are feared to be trapped under its rubble.

Information Minister Minendra Rijal had called on international aid agencies for help.

The quake also caused an avalanche on Mount Everest, with eight people confirmed dead. Mountaineer Alex Gavan tweeted that though he managed to be safe, there are still others that are missing on the mountain.