Mexico City ? A strong earthquake struck central Mexico on Monday, swaying tall buildings in the capital and rattling nerves in a city already tense from a swine flu outbreak suspected of killing as many as 149 people nationwide

Near the epicenter in the Pacific coast state of Guerrero, two women aged 67 and 75 died of heart attacks during or shortly after the earthquake, and four homes and a perimeter wall collapsed in and around the resort of Acapulco, state police reported.

There were no reports of injuries or major damages in Mexico City.

The quake had a magnitude of 5.6 and was centered near Chilpancingo, about 130 miles southwest of Mexico City or 50 miles from Acapulco, according to the U.S. Geological Survey.