A strong 6.6-magnitude earthquake rattled Bolivia and was also felt in Peru and Chile, but the epicenter was deep underground and there were no immediate reports of damage or casualties.

The US Geographical Survey said the quake's epicenter was 345 miles (556 kilometers) underground and located 37 miles south-southwest of Trinidad, the capital of Bolivia's northern Beni region.

The USGS initially gave the quake a 6.7 magnitude but later revised its reading down to 6.2 before raising it again later to 6.6.

The quake, which occurred at the beginning of the afternoon in Bolivia, was felt in major cities, including the capital La Paz in the west, Santa Cruz in the east, and Cochabamba in the center of the Andean nation, local media said.

Officials in neighboring Chile and Peru said the quake was also felt there, but again there were no reports of any significant consequences.

The strongest earthquake to strike Bolivia in modern times was an 8.2-magnitude temblor in 1994 that claimed five lives, according to the USGS, which monitors quakes worldwide and aggregates historical information.