Early Monday afternoon, a 5.6 magnitude earthquake shook Mexico City, sending residents into the streets who were already frightened by the latest swine flu outbreak.
There is no apparent significant damage as a result of the quake.
Residents were left jittery as the quake came while the country is battling with a swine flu outbreak, which has already claimed 149 lives.
The combination of the higher death toll from the flu and the quake weakened the peso, which had lost nearly 5% from Friday's close to MXN13.975 per U.S. dollar.
A press conference in which Health Minister Jose Angel Cordova was giving an update on the flu emergency situation was briefly interrupted by the quake.
The U.S. Geological Survey said the epicenter was in the Pacific coast state of Guerrero, home to the resort of Acapulco, which lies roughly 360 kilometers from Mexico City.