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Patients are evacuated in wheelchairs from the Hospital de Chalpultepec after an earthquake was felt in Mexico City, Tuesday March 20, 2012. A strong, long earthquake with epicenter in Guerrero state shook central southern Mexico on Tuesday, swaying buildings in Mexico City and sending frightened workers and residents into the streets. (AP Photo/Marco Ugarte)

Patients are evacuated in wheelchairs from the Hospital de Chalpultepec after an earthquake was felt in Mexico City, Tuesday March 20, 2012. A strong, long earthquake with epicenter in Guerrero state shook central southern Mexico on Tuesday, swaying buildings in Mexico City and sending frightened workers and residents into the streets. (AP Photo/Marco Ugarte)

Major earthquake rattles Mexico

A major earthquake struck Mexico on Mar. 20, unleashing panic as it damaged hundreds of buildings and caused homes in the capital to bounce like "trampolines".