Mexico will punish those responsible for an overpass collapse that killed at least 24 people and injured dozens when a train on Mexico City’s newest metro line plunged onto a busy road below, the government said on Tuesday.

Accompanied by officials involved in the construction and maintenance of the elevated metro line that collapsed on Monday night, President Andres Manuel Lopez Obrador said the investigation should be done quickly and that nothing should be hidden from the public.

“There’s no impunity for anyone,” he told a news conference. The city has been governed since the turn of the century by former mayor Lopez Obrador and his allies.

The crash has raised wider questions about safety on one of the world’s busiest metro systems, which carries millions of people daily across the capital’s urban sprawl.

Firefighters using heavy chains to stabilize the site pulled bodies and survivors from the wreckage before lowering one dangling carriage onto a truck in the afternoon. Some 79 people were injured, including three children, authorities said.

Video on social media showed the moment when the overpass suddenly plummeted onto a stream of cars near the Olivos station in the southeast of the city at around 10:30 p.m. (0330 GMT on Tuesday), sending up clouds of dust and sparks.

Monserrat, 26, said she was at the back of the train wagon when she heard a loud noise and the lights went out.

“Everybody screamed and we fell on top of each other,” she told Mexican radio.

Outside hospitals, family members grew frustrated waiting for information on relatives.

Angelica Cruz Camino, 31, said she had not heard from her husband since he was on his way home from work late Monday. She visited several hospitals and was told all victims were identified but she still had not found him by Tuesday afternoon.

“I called and called but he wasn’t answering me. Then it was my son who realized the metro collapsed,” she said outside Tlahuac public hospital. “I cannot find my husband.”

SUPPORTS SHAKING

The overpass that collapsed was part of Linea 12, an addition to the network finished less than a decade ago and long plagued by allegations of corruption and structural weakness.

In 2014, just two years after it opened, several of the line’s stations were closed for structural repairs.

Four people who live in the area told Reuters they observed the support structures below the elevated tracks visibly shaking when trains crossed. Some recalled warnings about the humid soil being unfit for major construction.

After a powerful 2017 earthquake, government data show there was also damage to the line’s support columns.

“Every time I saw the train, I saw the columns and beams shake,” said Victor Lara, a daily commuter on the line. “They’re not well made.”

Investigations will be carried out by the federal attorney general’s office, its Mexico City counterpart, and an external auditor, Norway’s DNV GL, officials said.

U.S. Vice President Kamala Harris and Canadian Prime Minister Justin Trudeau sent condolences to the families and friends of the victims of the accident and Lopez Obrador declared three days of national mourning.

Lopez Obrador was mayor of the city in the early 2000s, and current mayor Claudia Sheinbaum and Foreign Minister Marcelo Ebrard, who ran the city when Linea 12 was built, are both senior members of his political movement.

Linea 12 was built by a consortium of CARSO Infraestructura y Construccion, S.A.B. de C.V (CCICSA), a company controlled by the family of Mexican tycoon Carlos Slim, Mexico’s Grupo ICA, and the Mexican unit of France’s Alstom SA (ALSO.PA).

ICA shared a chart with Reuters indicating that CCICSA was responsible for construction on the section of the line that collapsed but declined to comment further.

A spokesman for CCICSA did not immediately respond to a request for comment on the chart, but said in an earlier statement to Reuters the company stood in solidarity with victims’ families and those injured. “We are going to wait for the official expert opinion,” CCICSA said.

Alstom said its involvement in the consortium was limited to certain aspects, including power supply and testing of some electromechanical work. The company said it would aid investigating authorities “in any way necessary.”

Sheinbaum said it appeared a girder had given way on the overpass, which she said was inspected last year. At a later news conference, she said the collapse seemed to indicate a “structural failure.”

“It is not possible to say categorically, but it seems this is what happened,” Sheinbaum said.

Ebrard said it was the “most terrible” accident to have hit the local transport system, and that he was ready to cooperate with authorities in the investigation.

Both urged the public to allow investigators to do their work before seeking to apportion responsibility.

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Families tell of desperate searches after Mexico metro collapse

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Samuel Del Aguila’s son was on his way home from his job at the airport in Mexico City on Monday night when his family saw the first news reports about a deadly metro train accident.

When 29-year-old Immer did not arrive home at the usual time, his family started to worry, and began calling his phone repeatedly.

Hours later, there was finally an answer, but the voice on the other end was not Immer.

“They found his cellphone,” Del Aguila said. The stranger on the line didn’t know Immer, his whereabouts, or if he was injured.

Del Aguila, 70, and other family members searched for Immer at nearby hospitals but did not find him. With heavy hearts, they eventually headed to the prosecutor’s office where the bodies of the train accident victims had been transported and braced for the worst.

“They told us to come here to see if he was with those who did not survive. And unfortunately he was,” said Del Aguila, sobbing gently.

Del Aguila’s family was one of many who endured agonizing searches and long waits for information about their loved ones after a metro overpass collapsed and a train plunged onto a busy street in southeast Mexico City late Monday, killing at least 24 people and injuring some 79 others.

Relatives of victims standing outside the city’s hospitals and the prosecutor’s office described a night of chaos and fear while desperately trying to contact relatives who had been on the train. Some were still missing on Tuesday afternoon.

Jorge Hernandez also learned his 28-year-old nephew Daniel had been seriously injured in the accident when a woman he didn’t know called from his phone.

“A lady found his phone … and it was the lady who contacted my brother last night,” Hernandez said.

Daniel underwent abdominal surgery and then was transported by helicopter to another hospital, all while Hernandez and other relatives pleaded for information on his whereabouts.

“It is not the moment for this bureaucracy,” Hernandez said.

Many of those Reuters spoke to blamed shoddy construction and political corruption for the collapse.

The overpass that collapsed was part of Linea 12, an addition to the metro network finished less than a decade ago, and long plagued by allegations of structural weakness.

“We are used to it, sadly. Politicians are used to investing 35% and stealing 65%. It is sad to see how they steal money,” Hernandez said.

At a news conference on Tuesday with officials involved in the construction and maintenance of the metro line that collapsed, President Andres Manuel Lopez Obrador said Mexico will punish those responsible for the crash and an investigation should be carried out quickly and transparently.

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