A strong earthquake has rocked Mexico City, although no damage or injuries were immediately reported.
Office workers rushed from swaying buildings, and cars pulled over to the roadside to ride out the tremors.
The earthquake, at about 1735 local time (2335GMT) was measured at a magnitude of 5.3.
About 10,000 people died when Mexico city was hit by a major quake in 1985. The city has implemented some of Latin America's toughest building codes.