A prolonged aftershock shook the ground and buildings in Chile's capital city of Santiago Wednesday.

The tremor in the capital occurred shortly after a strong 6.3-magnitude aftershock hit off the Chilean coast earlier Wednesday, triggering new fears in the southern-central town of Concepcion just days after a massive 8.8-magnitude quake devastated the region.

The quake felt in Concepcion was centered about 33 miles north-northwest from the coast, at a depth of 22 miles, the United States Geological Survey reported.

Emergency officials said there was no risk of a tsunami hitting the area shortly after the aftershock was felt.

Still, scared residents fled to higher ground, Reuters reported.

More than 800 people died after last weekend's quake and Chilean President Michelle Bachelet has said the death toll could rise.