People walk along a street in downtown Mexico City during an quake, on September 7, 2017. An earthquake of magnitude 8.0 struck southern Mexico late Thursday and was felt as far away as Mexico City, the US Geological Survey said, issuing a tsunami warning. It hit offshore 120 kilometers (75 miles) southwest of the town of Tres Picos in the state of Chiapas. Pic/AFP

A massive 8-magnitude earthquake hit off the coast of southern Mexico today, causing buildings to sway violently and people to flee into the street in panic as far away as the capital city.