Summary:
A powerful earthquake has struck Mexico, sending a strong current of uncertainty over the future of the country.

Full article:
(CNN) -- A 6.0-magnitude earthquake shook southern Mexico early Saturday, the U.S. Geological Survey said. The quake comes two days after a 6.4-magnitude quake rattled the same region. The epicenter of Saturday's quake was 294 kilometers (183 miles) southwest of Mexico City.