We don't talk about our sources, but we did an investigation for weeks, says Natalie Kitroeff, journalist for The New York Times on the case of the subway in Mexico City | Video | CNN

Mexican President Andrés Manuel López Obrador reacted to an investigation published by The New York Times on Sunday into the subway incident in Mexico City on May 3. According to the journalistic investigation of the American newspaper, serious failures in the construction of the work seem to have caused the collapse. The New York Times indicates that its report is based on government documents, interviews with people who worked on the construction of subway line 12, and analyzes conducted by experts. López Obrador said that there may have been leaks of official documents to the US media for their investigation, something that according to the president always occurs. AMLO mentions that in this case there could be an interest in magnifying information that would affect his Government.For her part, the head of government of Mexico City, Claudia Sheinbaum, denied that her government uses journalistic leaks to report on her work. Sheinbaum asked to wait for the rulings that will be offered by both a Norwegian company and the Mexico City Prosecutor's Office to find out what caused the collapse of a section of metro line 12. Natalie Kitroeff, a journalist for The New York Times, spoke with CNN about the investigation.A New York Times reporter spoke with CNN about the investigation.A New York Times reporter spoke with CNN about the investigation.