OAXACA, Mexico -- Southern Mexico was rattled by a magnitude-6.4 quake Thursday, but there were no reports of damage or injuries.

The temblor was felt in the southern states of Oaxaca, Chiapas, and Tabasco and it prompted some tourists and residents to rush out of buildings in the colonial city of Oaxaca.

The U.S. Geological Survey initially reported a magnitude of 6.6 for the quake, but later modified the calculation to 6.4. The temblor struck just before 2 p.m. in an area of Chiapas near the Guatemalan border.

Chiapas state Civil Defence director Ricardo de la Cruz told local media some people suffered panic attacks, but there were no reports of significant damage or injuries.

The Tabasco and Chiapas civil defence agencies also reported no serious damage.