The race to save those trapped in the rubble continues, more than 24 hours after a powerful earthquake hit the south coast of Mexico earthquake .
The earthquake of size 8.1 left at least 61 people dead, officials said.
Another 200 people were injured, said President Enrique Peña Nieto, when he declared a national mourning day.
Meanwhile the terrible category 1 of Hurricane Katia, which hit Veracruz on the east coast on Saturday, was shut down in a tropical storm.
The US National Hurricane Center reported that Katia had weakened rapidly since their landing, but the local authorities feared that the storm could still cause landslides and flooding.
Rescue efforts after the earthquake, which were struck late Thursday, are concentrated on the most affected countries Tabasco, Oaxaca and Chiapas.
Tens of thousands of emergency packages as well as 100 additional police and rescue dogs were sent to Juchitán, Oaxaca, which was the most affected city.
The earthquake is the strongest earthquake in the world since September 2015, but its depth - 70 km, according to the US Geological Survey - means that the surface felt shaking was not as strong as it would have been an equally powerful but unprofitable trembling.
At least 36 people were reported in Juchitán, according to the AFP news agency with the town hall and a number of other buildings that were destroyed or severely damaged.
Police officer Vidal Vera, 29, who had not slept for more than 36 hours, told AFP: "I do not remember a terrible earthquake.
"The whole city is now a disaster zone, much damage, many deaths, I do not know how you understand it, it's hard." My sister-in-law's husband died. over him. "
Peña Nieto, who visited the city on Friday, said the flags would fly on Saturday before the mast for the dead and the survivors.
The President said that 45 deaths had been reported in Oaxaca, 12 in Chiapas and 4 in Tabasco.
Arturo Wallace from the BBC says that the affected region is the poorest and least developed part of Mexico and that the extent of the damage still needs to be clarified.
At least one other person was killed in Guatemala, said the President.
The earthquake hit at 23:50 local time on Thursday (04:50 GMT Friday), shook buildings and caused panic hundreds of kilometers in the capital, Mexico City.
The earthquake also triggered a tsunami warning and the evacuation of thousands of people from coastal communities in Chiapas. The warning was then canceled.
During the entire Friday the area was shaken with dozens of replicas.
The office of President Peña Nieto said he would go to Chiapas to investigate the damage.
Pope Francis, who spoke of an outdoor exhibition during a visit to Colombia, said that he "prays for those who have lost their lives and their families".
The earthquake was more powerful than the 1985 earthquake, which struck near the city of Mexico City, causing thousands of deaths. The correspondents say the number of deaths seems to have been lower because it has been further away from heavily populated areas.
Journalist Franc Contreras, who was in Mexico City, told the BBC: "They could hear strong cracks in the concrete. It seemed that a huge wood branch was violently broken.
"People came out of the corridors, and all left a single file in the streets trying to avoid the airlines."
Jonathan Amos, BBC scientific correspondent
It is the largest earthquake that was experimented in 2017.
Regarding the statistics, it is expected that at least one million eight will occur on the planet every year.
It has occurred where the soil of the Pacific Ocean is drawn under Mexico and Guatemala. A large rock plate, known as Cocos tectonic plate, leads to the coast at a speed of 75 mm per year.
As it descends into the interior of the earth, about 200 km off the coast, great tremors are the inevitable result.
There were three grades in 2017, with a recorded depth of 7.9 in Papua New Guinea in January. The last event, a 8.2, is almost three times more energetic. This tells you something about how the scale works.
Fortunately this event was also profound. The break, which has torn more than 100 km of failure line, sank to 70 km. This will have limited some tremors, but as we have seen, there are still significant damage.