MEXICO: A strong, long 7.6 earthquake with an epicenter in Guerrero state shook central southern Mexico on Tuesday, swaying buildings in Mexico City and sending frightened workers and residents into the streets. The US Geological Survey set the intensity at 7.6 and said the epicenter was 11 miles underground. Mexico's National Seismological Survey said the temblor had an epicenter southwest of Ometepec.Mexico City Mayor Marcelo Ebrard's Twitter account said the water system and other "strategic services" were not experiencing problems.