A powerful 8.1 magnitude earthquake has hit southern Mexico, according to the US Geological Survey (USGS).
 On Tuesday struck eight kilometres southeast of Atencingo in the central state of Puebla at a depth of 51km, the USGS said.

The quake also shook buildings in the capital, Mexico City, and sent people fleeing into the street, according to reports.
Traffic came to a standstill, as masses of people blocked streets. Clouds of dust rose from fallen pieces of facades.
There were no immediate reports of casualties.
Mexican television and social media purportedly showed some buildings with severe damage in Mexico City.
More than 225 people were killed in the     deadliest earthquake in Mexico since 1985 [Pablo Ramos/AP]