Debris from a collapsed wall sits in Oaxaca, Mexico, after an earthquake early Friday, Sept. 8, 2017. A massive 8-magnitude earthquake hit off the coast of southern Mexico late Thursday night, causing buildings to sway violently and people to flee into the street in panic as far away as the capital city.A general view of Mexico City after an earthquake, in the early morning hours of Friday, Sept. 8, 2017. A massive 8.1-magnitude earthquake hit off Mexico’s southern coast, toppling houses in Chiapas state, causing at least three deaths and setting off a tsunami warning, officials said Friday.Guest of an hotel stand and sit at the lobby after an earthquake shook buildings forcefully and knocked out power in the area, just after midnight in Veracruz, Mexico, Friday Sept. 8, 2017. A massive 8-magnitude earthquake hit off the coast of southern Mexico late Thursday night, causing buildings to sway violently and people to flee into the street in panic as far away as the capital city and Veracruz state.People who evacuated from bars check their phones in the street in La Roma neighborhood of Mexico City, after an earthquake shook buildings forcefully and knocked out power in the area, just before midnight on Thursday, Sept. 7, 2017. A massive earthquake hit off the coast of southern Mexico late Thursday night, causing buildings to sway violently and people to flee into o the streets in panic as far away as the capital city. People who evacuated from bars check their phones in the street in La Roma neighborhood of Mexico City, after an earthquake shook buildings forcefully and knocked out power in the area, just before midnight on Thursday, Sept. 7, 2017. A massive earthquake hit off the coast of southern Mexico late Thursday night, causing buildings to sway violently and people to flee into o the streets in panic as far away as the capital city. People who evacuated from bars stand in the street in La Roma neighborhood of Mexico City, after an earthquake shook buildings forcefully and knocked out power in the area, just after midnight on Friday, Sept. 8, 2017. A massive 8-magnitude earthquake hit off the coast of southern Mexico late Thursday night, causing buildings to sway violently and people to flee into the street in panic as far away as the capital city.People who evacuated from bars during an earthquake stand in the street in La Roma neighborhood of Mexico City, sections of which lost power, just before midnight on Thursday, Sept. 7, 2017. A massive earthquake hit off the coast of southern Mexico late Thursday night, causing buildings to sway violently and people to flee into o the streets in panic as far away as the capital city.

Debris from a collapsed wall sits in Oaxaca, Mexico, after an earthquake early Friday, Sept. 8, 2017. A massive 8-magnitude earthquake hit off the coast of southern Mexico late Thursday night, causing buildings to sway violently and people to flee into the street in panic as far away as the capital city.(AP Photo/Luis Alberto Cruz)

MEXICO CITY (AP) — One of the most powerful earthquakes ever to strike Mexico has hit off its southern coast, killing at least 15 people, toppling houses and businesses and sending panicked people into the streets more than 650 miles (1,000 kilometers) away.

The U.S. Geological Survey said the earthquake hit off Chiapas state near the Guatemalan border with a magnitude as 8.1 — slightly stronger than the magnitude 8 quake of 1985 quake that killed thousands and devastated large parts of Mexico City.

National civil defense chief Luis Felipe Puente told the Televisa network that at least 15 people had died, 10 of them in Oaxaca, also close to the epicenter.

Hundreds of buildings collapsed or were damage, power was cut at least briefly to more than 1.8 million people and authorities closed schools Friday in at least 11 states to check them for safety.

“The house moved like chewing gum and the light and internet went out momentarily,” said Rodrigo Soberanes, who lives near the Chiapas state city of San Cristobal de las Casas.

The U.S. Geological Survey recorded at least 20 aftershocks of magnitude 4.0 or greater within about five hours after the main shake, and the president warned that a major aftershock as large as magnitude 7.2 could occur.

The USGS said the quake struck at 11:49 p.m. Thursday (12:49 a.m. EDT ; 0449 GMT Friday) and its epicenter was 102 miles (165 kilometers) west of Tapachula in Chiapas. It had a depth of 43.3 miles (69.7 kilometers).

The quake caused buildings to sway violently in Mexico’s capital more than 650 miles (1,000 kilometers) away. As beds banged against walls, people still wearing pajamas fled into the streets, gathering in frightened groups.

Chiapas Gov. Manuel Velasco said that three people were killed in San Cristobal, including two women who died when a house and a wall collapsed. He called on people living near the coast to leave their houses as a protective measure.

“There is damage to hospitals that have lost energy,” he said. “Homes, schools and hospitals have been damaged.”

Tabasco Gov. Arturo Nunez said two children had died in his Gulf coast state. One of them was killed when a wall collapsed, and the other was a baby who died in a children’s hospital that lost electricity, cutting off the infant’s ventilator.

The Pacific Tsunami Warning Center said waves of one meter (3.3 feet) above the tide level were measured off Salina Cruz, Mexico. Smaller tsunami waves were observed on the coast or measured by ocean gauges in several other places. The center’s forecast said Ecuador, El Salvador and Guatemala could see waves of a meter or less. No threat was posed to Hawaii and the western and South Pacific.

Mexican authorities said they were evacuating some residents of coastal Tonala and Puerto Madero because of the warning.

The quake hit as Mexican emergency agencies were bracing for another crisis on the other side of the country. The U.S. National Hurricane Center said Hurricane Katia was likely to strike the Gulf coast in the state of Veracruz early Saturday as a Category 2 storm that could bring life-threatening floods.

In neighboring Guatemala, President Jimmy Morales spoke on national television to call for calm while emergency crews checked for damage.

“We have reports of some damage and the death of one person, even though we still don’t have details,” Morales said. He said the unconfirmed death occurred in San Marcos state near the border with Mexico.

The quake occurred in a very seismically active region near the point of collision between three tectonic plates, the Cocos, the Caribbean and the North American.

Mexico’s National Seismological Service said the area has seen at least six other quakes of magnitude 7.0 or greater since 1900 — though three of those all occurred within a nerve-wracking nine-month span in 1902-1903.

The new quake matched the force of a magnitude 8.1 quake that hit the country on June 3, 1932, roughly 300 miles (500 kilometers) west of Mexico City.

A study by Mexico’s National Seismological Service said that quake is believed to have killed about 400 people, causing severe damage around the port of Manzanillo. A powerful aftershock that hit 19 days later caused a tsunami that devastated 15 miles 25 kilometers of coastline, killing 75 people.

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