A 7.4-magnitude earthquake struck Nepal near the border with China Tuesday, the U.S. Geological Survey has said.

The quake struck 49.7 miles (80 kilometers), east of capital Kathmandu. A 5.6-magnitude aftershock was also reported, the survey said.

Strong tremors were felt in northern India, Bangladesh and China, it added.

"We are fine. Just need to clear a house that fell down. 4 of us, with 2 trucks. Shook here few seconds," tweeted Matt Crook, a spokesperson for the anti-poverty nongovernmental organization Plan Global, who was in Nepal for the aftermath of April's quake.

The new quake has raised fears about further casualties as social media users reported the collapse of buildings already fragile after a devastating earthquake hit the country on April 25.

The quake had killed more than 8,100 people and injured almost 18,000 others, according to Nepali police.

Anadolu Agency