An earthquake rattled central Mexico on Monday, swaying buildings in Mexico City. Some office workers rushed to the streets in the capital.
Mexico City Mayor Miguel Angel Mancera wrote in his Twitter account that there was no immediate word of damage or casualties.
The U.S. Geological Survey said the quake had a magnitude of 5.5 and its epicenter was in the sparsely populated mountains north-east of Acapulco, about 160 miles (260 kilometers) south of Mexico City.
Mexico's National Seismological Center said it was centered on the southern Pacific Coast, inland from the resort of Acapulco. The quake was also felt strongly there, but no damage was immediately reported.
Because of its site on an unstable former lake-bed, Mexico's capital often feels such quakes strongly even if they occur some distance away.