People quickly posted video of Mexico City's earthquake to email and on social media.
A magnitude 7.1 earthquake rocked central Mexico on Tuesday, killing at least 55 people as buildings collapsed in plumes of dust and thousands fled into the streets in panic.
The quake came less than two weeks after another quake left 90 dead in the country's south, and it occurred as Mexicans commemorated the anniversary of a 1985 quake that killed thousands.
Dozens of buildings collapsed or were damaged in in densely populated parts of Mexico City and nearby states. A column of smoke rose from a structure in one central neighborhood in the capital.
