Such basic deficiencies, Lara said, could not have been found through routine inspection or avoided through regular maintenance.
By announcing the results of his office on Thursday, Advocate General Ernestina Godoy Ramos described the report as “an in-depth, serious, scientific study conducted by experts.”
An independent report issued earlier this year by the Norwegian risk management company DNV also found serious design defects, including placement and welding of metal sticks. The Mexico City government had hired DNV to investigate the causes of the crash.
The subway crash has triggered political shocks, which has left some of Mexico’s most powerful people, including Secretary of State Marcelo Ebrard, who was mayor of Mexico City when the line was built.
Mr Ebrard and the current mayor, Claudia Sheinbaum, are both expected to seek the presidency in the 2024 election.