Last month's deadly Mexico City train collapse was caused by a long list of structural issues.
That’s according to preliminary finds announced on Wednesday by the city's head of public works, Jesus Esteva.
"The train collapse was caused by the following conditions: deficiencies in the construction process, the welding of bolts, porosity and the lack of fusion at the bolt-girder joint, a lack of Nelson bolts in the girders in the overpass construction, different types of concrete in the slab, and welding that was not finished or poorly executed."
The collapse of the Line 12 metro route was Mexico’s biggest train accident in years.
It killed 26 people and put pressure on close allies of President Andres Manuel Lopez Obrador.
That includes Mexico City Mayor, Claudia Sheinbaum, and her predecessor, now Foreign Minister Marcelo Ebrard.
Sheinbaum has faced questions about the line’s maintenance, while Ebrard is under fire over the line’s construction in 2012 during his term.
Both are seen as possible successors to Lopez Obrador.
The incident further put a spotlight on Carlos Slim, Latin America’s richest man.
He owns Grupo Carso, the construction company that built the collapsed section of Line 12.
Grupo Carso said in a statement that it would not comment until a final conclusion is published.
Sheinbaum told media on Wednesday that further reports will come out in the next few months.