At least 58 people were killed Friday, when a powerful 8.2-magnitude quake struck southern Mexico, authorities said. The quake, which measured an 8.1 on the Richter scale, struck off the coast of the Southern coast of Mexico, just southwest of the city of Pijijiapan, and southeast of Salina Cruz. "Tsunami waves reaching more than 3 meters above the tide level are possible along some coasts of Mexico".
Mexican President Enrique Pena Nieto also reportedly said that 65 aftershocks were felt after the quake.
At least 20 deaths were reported in Mexico's Oaxaca state.
President Peña Nieto has declared a day of mourning, saying flags would fly at half mast out of respect for the dead and bereaved. The last major natural disaster to have shaken up Mexico was the 1985 tremor, which has resulted in the death of thousands of people.
The quake was felt in Mexico City and Guatemala City.
Alejandro Murat told local television that 17 of the deaths were recorded in the southeastern town of Juchitan.
A tsunami alert issued for the Pacific coast of Mexico "does not represent a major risk", he said. One video posted on Twitter early Friday showed tremors rocking Mexico City's Angel of Independence monument.
The interior ministry said the quake had a magnitude of 8.4, while the US Geological Survey put it at a revised 8.1, up from 8.0 initially.
Chiapas Gov. Manuel Velasco said that three people were killed in San Cristobal, including two women who died in San Cristobal when a house and a wall collapsed. At least one person also died in Guatemala. Residents of the Mexican capital fled into the streets, many in their pajamas, for fear buildings would collapse.
The quake struck as Hurricane Katia continues to churn in the warm waters of Gulf of Mexico.