Crews Battling Fires on Highway 67
Aftershocks rattled the region Monday in the wake of Sunday's major quake.
Sunday's quake may be the strongest the region has felt.
Sunday's quake centered just south of the U.S. border near Mexicali.
Updated: Buildings were damaged in San Diego and Calexico by Sunday's quake.
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Quake that killed at least two in Mexico damages San Diego buildings and shatters windows.