Over 230 dead in Mexico quake as rescuers desperately search for survivors
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WATCH: Rescuers used infrared cameras to scan debris and listened for the sound of survivors' voices in one school where at least 25 of the more than 200 people killed in the earthquake died.

At least 230 people, including 21 schoolchildren, are dead after a magnitude 7.1 earthquake rocked central Mexico on Tuesday afternoon, hitting on the 32nd anniversary of the biggest quake to strike the country's capital.

Rescuers worked tirelessly on Wednesday night as reports surfaced of at least one girl -- and possibly other children -- who have been located alive beneath the rubble of the Enrique Rebsamen school.

Yesterday's earthquake was centered about 75 miles southeast of Mexico City and caused extensive damage, leveling at least 44 buildings, including homes, schools and office buildings, according to Mexican President Enrique Pena Nieto, who did a flyover of the city Tuesday afternoon.

Among the dead are at least 25 people — 21 students and four teachers — at a collapsed primary school in the south of the capital. So far, 11 people have been rescued, but two students and one teacher remain missing, according to Education Minister Aurelio Nuno.

In Mexico City alone, 52 people have been rescued from damaged buildings, according to city officials.

The coffins of Agueda Mendoza and Gabriel Morales, a couple who died in the September 19 earthquake are taken out of the the hearse for their funeral in Mexico City on September 22, 2017. Photo Credit: Pedro Pardo/AFP/Getty Images
The view of the damage to structures in San Juan Pilcaya, Puebla State, Mexico which is the closest town to the epicenter of the earthquake that struck Mexico on Sept. 19, 2017. Eight five percent of the struct... Photo Credit: Samuel Vazquez/EPA
Family members embrace as they wait for news of their missing relatives outside a quake-collapsed seven-story building in Mexico City's Roma Norte neighborhood,Sept. 22, 2017. Photo Credit: Rebecca Blackwell/AP Photo
A list with names of persons still missing in a quake-collapsed seven-story building, is posted in Mexico City's Roma Norte neighborhood, Sept. 22, 2017. Photo Credit: Rebecca Blackwell/AP Photo
Japanese rescuers with sniffer dogs take part in the search for survivors at a flattened building in Mexico City on September 22, 2017 three days after a strong quake hit central Mexico. Photo Credit: AFP/Getty Images
Volunteer rescue workers sleep during a break in the search for survivors in Mexico City on September 21, 2017, two days after a 7.1 earthquake shook central Mexico two days ago. Photo Credit: Ronaldo Schemidt/AFP/Getty Images
Rescuers make the signal for silence during the search for survivors in a flattened building in Mexico City, Sept. 21, 2017, two days after a strong quake hit central Mexico killing at least 240 people.

Photo Credit: Ronaldo Schemidt/AFP/Getty Images

Rescue workers search for survivors in a collapsed building after an earthquake in Mexico City, Sept. 21, 2017. Photo Credit: Carlos Jasso/Reuters
Rescuers lower a sniffer dog to help them search for survivors in a flattened building in Mexico City on Sept. 21, 2017 two days after a strong quake hit central Mexico. Photo Credit: Ronaldo Schemidt/Getty Images
Rescue workers work on a collapsed building after an earthquake at the Obrera neighborhood in Mexico City, Mexico, Sept. 20, 2017. Photo Credit: Carlos Jasso/Reuters
A group of men arrive carrying beams of wood to offer their services at a site of earthquake damage in the Roma neighborhood in Mexico City, Sept. 20, 2017. City residents are roaming the streets looking for wa... Photo Credit: Rebecca Blackwell/AP
Rescuers, firefighters, policemen, soldiers and volunteers remove rubble and debris from a flattened building in search of survivors after a powerful quake in Mexico City on Sept. 19, 2017.

Photo Credit: Ronaldo Schemidt/AFP/Getty Images

A woman speaks on her cell phone as people are evacuated from office building gather in Reforma Avenue after an earthquake in Mexico City, Sept. 19, 2017. Photo Credit: Rebecca Blackwell/AP
A rescuers pulls a dog out of the rubble during the search for survivors in Mexico City, Sept. 20, 2017, after a strong earthquake hit central Mexico on Sept. 19, 2017. Photo Credit: Yuri Cortez/AFP/Getty Images
Members of the Mexican Army nap after assisting in the search and rescue of people trapped in collapsed buildings in Colonia Condesa in Mexico City, on Sept. 20, 2017. Photo Credit: Gary Coronado/LA Times via Getty Images
Rescuers look for survivors after an earthquake in Mexico City, Sept. 19, 2017. Photo Credit: Mario Vazquez/AFP/Getty Images
A man is pulled out of the rubble alive following an earthquake in Mexico City, Sept.19, 2017. Photo Credit: Ronaldo Schemid/AFP/Getty Images
Women help each other out of the National Lottery building know as "El Moro," which was damaged by a 7.1 magnitude earthquake, in Mexico City, Sept. 19, 2017. Photo Credit: Jenifer Nava/RCC/Agencia EL UNIVERSAL via Newscom
People walk past victims of a powerful quake in Atzala, Puebla, Mexico, Sept. 19, 2017.

Photo Credit: Jose Castanares/AFP/Getty Images

Rescuers, firefighters, policemen, soldiers and volunteers remove rubble and debris from a flattened building in search of survivors after a powerful earthquake in Mexico City, Sept. 19, 2017. Photo Credit: Ronaldo Schemidt/AFP/Getty Images
Rescue workers remove a dead body after searching through rubble in a a search for students at Enrique Rebsamen school in Mexico City, Mexico, Sept. 20, 2017. Photo Credit: Carlos Jasso/Reuters
Residents of Mexico City working to remove debris of a collapsed building and looking for possible victims after a 7.1 magnitude earthquake rattled Mexico City, Sept. 19, 2017. Photo Credit: Omar Torres/AFP/Getty Images
A man walks out of the door frame of a building that collapsed after an earthquake, in the Condesa neighborhood of Mexico City, Sept. 19, 2017. Photo Credit: Marco Ugarte/AP
Rescuers carry on a stretcher a person wounded during a quake in Mexico City, Sept. 19, 2017. Photo Credit: Ronaldo Schemidt/AFP/Getty Images
A car parked on the street in Mexico City sits under debris from a damaged building after a 7.1 earthquake rattled Mexico City, Sept. 19, 2017.

Photo Credit: Alfredo Estrella/AFP/Getty Images

People react as a 7.1 magnitude earthquake rattles Mexico City on September 19, 2017. An earthquake drill was being held in the capital at the time that today's quake struck. Photo Credit: Ronaldo Schemidt/AFP/Getty Images
People look for possible victims after walls of a building collapsed during a quake in Mexico City, Sept. 19, 2017. Photo Credit: Ronaldo Schemidt/AFP/Getty Images

President Donald Trump spoke with Mexico's President Enrique Peña Nieto Wednesday to extend condolences for the lives lost and the damage caused by the earthquake, the White House said in a statement. Trump also offered assistance and search and rescue teams, which are being deployed now.

Rescuers continued to comb through the wreckage, looking for survivors Wednesday, pausing to listen for voices. Relatives told The Associated Press they received WhatsApp messages from two girls inside.

"Children are often the most vulnerable in emergencies such as this, and we are particularly concerned because schools across the region were in session and filled with students," said Jorge Vidal, the director of operations at Save the Children in Mexico.

Map locating earthquake that struck Mexico on September 19, 2017.

Hanna Monsivais, the programs coordinator for Save the Children in Mexico, said she has been out on the streets in Mexico City with hundreds of other people trying to help their neighbors. But entire streets have been cordoned off, and numerous buildings are still too dangerous to enter because of damage.

"Volunteers are bringing water, food, clothes and face masks so that they can help the official authorities move all the debris and rocks, because there are still people trapped under buildings," she said.

She added, "Every once in a while, authorities ask for silence so they can hear the people who are still trapped. It's amazing what people are doing for others, but some people are clearly still in complete shock."

Many areas were still without power today, and communications remained limited, Monsivais said.

"This night is going to be tough," she said. "For sure, tomorrow the death toll will rise."

Rescue teams work at the Rebsamen school in Mexico City,, Sep. 20, 2017.

Mexico City's airport descended into chaos as the ground rippled and chunks of plaster fell from walls when the earthquake hit, Dallas resident George Smallwood told ABC News.

"I felt the ground shaking, and I heard everyone screaming and starting to run," he said, adding that he initially thought he was in the middle of a terrorist attack.

Smallwood stopped in Mexico City for a long layover after a vacation in Medellin, Colombia, and spent the day exploring the capital. He was getting ready to go through security at Mexico City International Airport for his 3:35 p.m. flight back to Dallas when the earthquake struck.

People look for possible victims after walls of a building collapsed during a quake in Mexico City, Sept. 19, 2017.

Parts of the ceiling were "swinging back and forth," he said, and the panicked crowd took off "running in every different direction."

The tremors lasted for six to seven minutes, he estimated. After the shaking subsided, first responders swooped in to help the injured, and a fleet of military and police helicopters buzzed overhead, he said.

Smallwood's flight was rescheduled for 8:30 a.m. today, so he needed to find somewhere to stay for the night, he said.

Rescuers carry on a stretcher a person wounded during a quake in Mexico City, Sept. 19, 2017.

Tuesday's earthquake — which hit around 1:14 p.m. local time near the town of Raboso in Puebla state, according to the United States Geological Survey — came 12 days after a magnitude 8.1 quake struck off Mexico's southern Pacific coast, killing dozens of people.

The Sept. 7 earthquake devastated Juchitan in Oaxaca, where at least 36 people died and one-third of the city's homes collapsed or were rendered uninhabitable, according to Mexico's president.

Residents there were still reeling from that quake when they were rattled again Tuesday.

"People, rightfully so, were already sleeping outside because of fear for aftershocks, and then comes this big earthquake," said Eduardo Mendoza, a senior program manager for Southern California–based medical supplier Direct Relief.

A rescuers pulls a dog out of the rubble during the search for survivors in Mexico City, Sept. 20, 2017, after a strong earthquake hit central Mexico on Sept. 19, 2017.

Mendoza, who was in the Oaxaca region mobilizing disaster relief, said Hurricane Katia and now two devastating earthquakes have taken a psychological toll on residents, who are too afraid to sleep inside their adobe homes.

Shelters in Juchitan are still filled with children and the elderly, he said.

An earthquake registering 7.1 magnitude struck Mexico City, Sept. 19, 2017.

First responders there have been in a rush to return to Mexico City to help and "focus on what's coming next," he added.

Pena Nieto was supposed to be en route to Juchitan to commemorate the anniversary of the Michoacan earthquake of 1985 when Tuesday's quake sent ruinous ripples through Mexico City.

"It was like a kick in the gut for everybody," Mendoza told ABC News in a telephone interview today. "The emergency response teams were here, and a good number of them for two hours were just trying to find their family members."

A firefighter and a rescuer search for survivors in Mexico City, Sept. 20, 2017, after an earthquake hit central Mexico on Sept 19, 2017.

Thousands of people on Mexico City's main boulevard streamed out of buildings and into the streets in panic when the quake struck.

"I was just paying at the supermarket, and suddenly the floor went boom, boom," Mexico City resident Lara Rodriguez told ABC News on Tuesday. "People were obviously panicking."

She added, "So I rushed out, and I went to get my kid from school to make sure he was OK. Luckily, everything was fine, but on the way there was a lot of debris. There were clouds of sort of dust flowing up as if a bomb had hit or something."

A car parked on the street in Mexico City sits under debris from a damaged building after a 7.1 earthquake rattled Mexico City on September 19, 2017.

Dramatic photos and video depicted the destruction in Mexico City.

Flames and a large explosion could be seen in a video posted on Twitter, and a window panel was spotted falling from an office building in Mexico City in a video posted on Instagram.

Video recorded inside an office building showed the overhead lights swinging wildly as the ground shook.

Meanwhile, chaos broke out in the newsroom of Milenio, a Mexican news site.

Several cars were damaged by falling debris.

Mexico City, built on a former lake bed, is one of the worst possible places for an earthquake to strike because of its soil, which can amplify shaking by factors of 100 or more, California-based seismologist Lucy Jones told ABC Los Angeles station KABC-TV. By comparison, in Los Angeles the worst earthquake amplification is fivefold, Jones said.

Rescuers look for survivors after an earthquake in Mexico City, Sept. 19, 2017.

Earlier in the day, earthquake drills were held in Mexico City to mark the anniversary of the Michoacan earthquake, which caused widespread deaths and injuries as well as catastrophic damage in Mexico City.

At the Instituto Morelos secondary school, which partly collapsed, school director Adelina Anzures told The Associated Press that the school conducted an earthquake drill in the morning, just two hours before the quake struck.

"I told them that it was not a game, that we should be prepared," she said of the drill.

When the quake came, she said, the children and teachers rapidly filed out.

"It fell, and everything inside was damaged," Anzures said, adding that nobody there was hurt.

Narciso Suarez of Mexico City said he was attending a meeting on the ninth floor of a high-rise building when he first felt the quake. He said authorities in the building ordered those inside to shelter in place, "at least until the shaking passed."

Suarez, who was also in the area Sept. 7 when the last earthquake struck, said Tuesday's temblor was "a lot worse."

With the previous earthquake, "we immediately evacuated the building, and we saw no damage," he said. "But today ... there are a lot of buildings that have collapsed in this neighborhood. It's really sad."

U.S. President Donald Trump tweeted Tuesday afternoon, "God bless the people of Mexico City. We are with you and will be there for you."

Vice President Mike Pence echoed those comments, tweeting, "Our hearts are with the people of Mexico City. We're thinking of you and, as @POTUS said, we are with you."

The State Department said in a statement, "We stand ready to provide assistance should our neighbors request our help. Our embassy in Mexico City has sent out public messages to U.S. citizens in Mexico, and the embassy stands ready to provide consular assistance to any U.S. citizens who may have been affected. We offer our condolences to any who were injured or lost loved ones."

ABC News' Fergal Gallagher, Benjamin Gittleson, Matt Gutman, Joshua Hoyos, Bonnie Mclean, Kirit Radia and Robert Zepeda contributed to this report.