Strong earthquake rocks Mexico

8 of 11: Federal Police block off a street along Avenida Reforma 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/Alexandre Meneghini) (AP Photo/ Alexandre Meneghini)

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