2nd earthquake hits Indonesia following powerful magnitude 7.7 quake

A magnitude 6.9 earthquake hit Indonesia just hours after a more powerful magnitude 7.7 quake struck off the coast of the eastern part of the country, according to the U.S. Geological Survey.

At least 53 people have been killed, according to the National Disaster Management Agency (BNPB), with the earthquakes knocking down some buildings and leading hundreds to evacuate amid fears of a tsunami, officials said. Dozes of others were injured.

More than 300 houses were destroyed or damaged, according to Indonesia's National Disaster Management Agency.

More than 100 public facilities have also been destroyed or damaged, including 87 educational facilities, 18 health facilities, six offices and five places of worship.

Emergency crews, including members of the Indonesian National Armed Forces, were conducting evacuations and assessing damage.

The agency said the earthquake, which struck shortly before 5 a.m. local time, was strongly felt across the province of East Nusa Tenggara.

The quake initially triggered fears of a tsunami, and a warning from Indonesia's Meteorology, Climatology and Geophysics Agency, issuing alerts to stay away from beaches and calls for people to evacuate. However, those warnings later expired, according to the Associated Press.

Before then, about 2,000 residents in the Nagekeo Regency on the Flores island "carried out self-evacuation as a precautionary measure after the earthquake and due to the early warning of a tsunami," the disaster management agency said.

The earthquake's epicenter was located about 60 kilometers north-northwest of Ende in Indonesia's Flores region at a depth of about 10 kilometers, according to USGS.

There were a number of strong aftershocks reported nearby, including a 6.1 quake and a 5.9 quake also north of Ende, according to the USGS. 

Photos from the area showed damage to buildings. 

ABC News' Morgan Winsor contributed to this report.