Update 9 (9:10 pm ET): The head of Mexico's National Civil Defense agency says the death toll from a major earthquake that rattled the center of the country has reached 139.
Luis Felipe Puente said 64 people had died in the state of Morelos, just south of Mexico City, though local officials reported only 54.
In addition, 36 people died in Mexico City, 29 in Puebla state, nine in the State of Mexico and one in Guerrero.
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Update 8 (7:15 pm ET): Death toll from Mexico earthquake now at 119, according to state and city officials.
That makes it the deadliest to hit the country since the 1985 quake that, in an incredible coincidence, occurred exactly 32 years ago today, surpassing the death toll from another earthquake the shook the region less than two weeks ago.
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Update 7 (6:50 pm ET): Mexico City government says 30 dead in capital, bringing nationwide total to 94, according to AP.
Mexico City Mayor Miguel Angel Mancera said that the number of buildings that collapsed has risen to 44, and that between 50 and 60 people have been pulled alive from rubble.
Horrifying videos of buildings crumbling into piles of rubble continue to emerge on Twitter.
Journalists in Mexico City are sharing reports of ordinary citizens rushing to pull people from the rubble. Here's more from the AP.
Carlos Mendoza was standing just blocks away when an apartment building collapsed in Mexico City's trendy Roma neighborhood.
The 30-year-old joined the rescue efforts and said he has been able to pull two people alive from the rubble in three hours of work.
"When we saw this we came to help. This is ugly, very ugly," he said, covered in dust.
Also in Roma, Alma Gonzalez was in her fourth floor apartment when the quake collapsed the ground floor of her building, leaving her no way out.
She was terrified until the people living in the neighboring house mounted a ladder on their roof and helped her slide out a side window.
"They helped us leave with a ladder," Gonzalez said. "I think my father the Lord who has us here for some reason."
...and more from the NYT
Buildings also collapsed across the neighborhoods of Condesa, another fashionable district in the city constructed atop soft soil and extremely vulnerable to earthquakes. Outside, thousands and thousands stood in the streets, avenues and sidewalks, filling the popular neighborhoods with a sense of dread.
On Laredo Street, an entire eight-story apartment building had fallen into the road, leaving an enormous heap of concrete and rubble pouring into the street. At least 100 people stood atop the pile clearing it by hand, piece by piece, passing boulders and twisted steel pipes along a human chain that radiated from the heap like spokes.
Update 6 (6:30 pm ET): More than 3.8 million Mexicans are without power after today's quake, while the death toll climbs to 79, according to the AP.
Here's a particularly harrowing video of what looks like an old warehouse collapsing like a house of cards during the earthqake.
BREAKING VIDEO: MEXICO CITY DURING THE POWERFUL EARTHQUAKE MOMENTS AGO. pic.twitter.com/G5G9Ys64pD— Breaking News Feed (@pzf) September 19, 2017
In another video, viewers can hear alarms ringing out across the city as smoke billows out of buildings.
Damn man the world is falling apart, today mi city got a worse earthquake than last week, 20+ buildings down and unknown number of peolple pic.twitter.com/8e8JfF7IET— EliasNicolopulos (@MexicanSkydiver) September 19, 2017
...and here's video of people stampeding out of Mexico's Chamber of Deputies...
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Update 5 (6 pm ET): The death toll has risen to 61, according to the Associated Press.
Morelos Gov. Graco Ramirez reported on Twitter that at least 42 people had died in his state south of Mexico City. At least 11 others died in Puebla state, according to Francisco Sanchez, spokesman for the state's Interior Department. There were no immediate official reports of deaths in the capital, but anecdotal reports of deaths in Mexico City had begun to circulate.
One Mexico City resident described her experience to the AP:
Mariana Morales, a 26-year-old nutritionist, 26, was one many who spontaneously participated in rescue efforts.
She wore a paper face mask and her hands were still dusty from having joined a rescue brigade to clear rubble from a building that fell in a cloud of dust before her eyes, about 15 minutes after the quake.
Morales said she was in a taxi when the quake struck, and she out and sat on a sidewalk to try to recover from the scare. Then, just a few yards away, the three-story building collapsed.
Here's another live feed:
Meanwhile, more photos have begun to emerge. These come courtesy of Axios.
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Update 4 (5:14): President Nieto has confirmed that the death toll has risen to 53. EPN has declared a national state of emergency to deal with the aftermath of the quake.
Follow along with live coverage of the quake aftermath below:
Education Minister Aurelio Nuño tweeted "all public and private schools in Mexico City are cancelled until further notice." He said schools in the states of Puebla and Guerrero also are closed until further notice.
Update 3 (5 pm ET): Mexican President Enrique Pena Nieto will give a statement about today's quake later tonight. In the meantime, he has urged people to stay off the streets. The water system in Puebla, the state where today's earthquake was centered, has been damaged, according to media reports.
More footage and images of the quake are beginning to emerge, including this shot, taken by a drone camera, of a building collapsing in Mexico City. In a series of tweets, EPN warned residents returning to their homes to turn off the gas and close the door. He also noted that patients from damaged hospitals were being evacuated, and that Mexico's IMSS and ISSSTE emergency services are open to the entire population.
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Update 2 (4:38 pm ET): The governor of the Mexican state of Morelos said at least 42 people have died in the central Mexican state, which shares a border with Puebla, the state that contains Mexico City. Counting the five confirmed deaths in the state of Puebla, the quake's body count has risen to 47.
Meanwhile, the Mexican government has asked to restrict phone and internet use to emergency situations only as the Mexican military has arrived in the Roma and Condesa areas of the capital city.
*MEXICAN MILITARY ARRIVE IN ROMA, CONDESA AREA OF CAPITAL
*MEXICO GOV ASKS TO RESTRICT PHONE, INTERNET FOR EMERGENCIES
Mexico City's governor says 27 buildings have collapsed...
*MEX. PRES SAYS 27 BUILDINGS IN MEX CITY HAVE COLLAPSED:TELEVISA
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Update (4:05 pm ET): The BBC is reporting that several deaths have already been reported as a result of the quake. Reuters says at least five have been killed. The AP quoted Mexico City's mayor as saying that there are reports of peole still trapped in collapsed buildings.
President Donald Trump has taken time out of his day of meetings at the UN to tweet his support: "God bless Mexico City. We are with you and we will be there for you."
God bless the people of Mexico City. We are with you and will be there for you.— Donald J. Trump (@realDonaldTrump) September 19, 2017
Meanwhile, there are reports that tremors were felt as far away as Guadalajara, more than 300 miles away...
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On the anniversary of a massive 1985 earthquake that killed at least 5,000 people, Mexico City has been shaken by another powerful earthquake, the second the shake the city in the past two weeks. The 7.1 magnitude quake shook buildings in the capital city, sending thousands rushing into the streets, according to Reuters.
The earthquake damaged hundreds of buildings in the city, according to initial reports. Ironically, the quake hit only hours after many people participated in earthquake drills around the nation - drills specifically timed to mark the anniversary of the 1985 earthquake.
The epicenter of the quake was 5 miles (8 km) southeast of Atencingo in the central state of Puebla at a depth of 32 miles (51 km), Reuters reported, citing the US Geological Survey.
A powerful 8.1 quake hit Mexico earlier this month, killing at least 98 people.
Accordin to the Associated Press, much of Mexico City is built on former lakebed, and the soft soil can amplify earthquakes even hundreds of miles away.
The Mayor of Mexico City announced on Twitter that he had activated an earthquake-related emergency committee to organize and supervise the city's response to the quake.
Mexican President Enrique Pena Nieto announced that he is returning to Mexico City immediately, and would convene an emergency council to supervise the federal government's role in the disaster response. He is presently on a flight headed for Oaxaca.
En vuelo a Oaxaca. Regreso de inmediato a la Ciudad de México para atender la situación por sismo.— Enrique Peña Nieto (@EPN) September 19, 2017
At least one flight from Dallas to Mexico City was being diverted to Monterrey as the Mexico City airport ceased operations to conduct a thorough review...
The breaking news headlines are still rolling in...
*MEXICO CITY QUAKE DAMAGED HUNDREDS OF BUILDINGS
*MEXICO CITY AIRPORT SUSPENDS OPS UNTIL INFRA REVIEW IS DONE
*MEXICO CITY AIRPORT SAYS IT'S INSPECTING RUNWAYS AFTER QUAKE
*MEXICO CITY AIRPORT SAYS IT'S INSPECTING TERMINALS FOR DAMAGE
*MEXICAN BOLSA CEO: STILL DECIDING WHETHER TO RESUME OPS TODAY
*MEXICO CITY QUAKE DAMAGES DOZENS BUILDINGS IN FIN. DISTRICT
*MEXICO CITY AIRPORT SAYS IT'S INSPECTING RUNWAYS AFTER QUAKE
*MEXICO CITY POLICE CLOSE OFF STREETS IN ZONA ROSA AREA
*NO QUAKE DAMAGES REPORTED AT THE MOMENT:MEXICO CIVIL PROTECTION
*7.1 MAG. EARTHQUAKE PUEBLA MEXICO :EMSC
*7.1 MAG. EARTHQUAKE CENTRAL MEXICO :GFZ
*MEXICO CITY QUAKE CAUSES POWER OUTAGE IN FINANCIAL DISTRICT
*MEXICO CITY BUILDINGS SHAKE IN EARTHQUAKE
*MEXICO BUILDINGS ROCK IN APPARENT QUAKE
*SMOKE SEEN COMING UP FROM SOME BUILDINGS IN MEXICO CITY
*MEXICO STOCKS FALL NEAR SESSIONS LOWS AFTER QUAKE
*SOME BUILDINGS IN ROMA NEIGHBORHOOD IN MEXICO CITY COLLAPSED
Here's a map showing where the quake occurred:
Images of collapsed buildings populated twitter as residents documented the damage...
Roads around terminals at the Mexico City airport were damaged...
Roads around Terminal 2 at Mexico City International Airport are damaged. Flights diverting ???? pic.twitter.com/7IDXOFMLCz— Flight Alerts ? (@FlightAlerts777) September 19, 2017
Pictures of the damage are just starting to emerge on twitter:
Mexican stocks fell to the lows of the day after the quake, while the dollar surged against the peso.
Video showing the aftermath of a building collapse has emerged...
Here's a clip of an office building shaking...
A powerful earthquake has shaken Mexico City, causing buildings to sway sickeningly. The extent of damage/injuries was not immediately clear pic.twitter.com/rZ3fQsAPas— Behind The News (@Behind__News) September 19, 2017
A video taken inside what appears to be a well-furnished apartment depicts the room shaking and dressers toppling over....
...in another video, plumes of smoke can be seen rising from buildings.
BreakingNLive: BREAKING NEWS: VIDEO SHOWS DEBRIS OVER MEXICO CITY AS SEVERAL BUILDINGS HAVE COLLAPSED AFTER M 7.1-… pic.twitter.com/TrbzWxWejG— Gosippy TabLloyd (@LloydZiel) September 19, 2017
Another video shows Mexico City's National Employment Service building shaking...
Footage from tourist attraction Xochimilco showed tourists having a harrowing time as the quake caused choppy waters - "this is a bad idea to be one this boat!" one tourist can be heard shouting.
And here is footage of a factory explosion caught on camera.