In March 2012, the newspaper El Mundo published a story according to which FGV had instructed employees who were to testify at the crash commission investigation, providing a set of possible questions and guidelines to prepare the answers. In April 2013, the television program Salvados questioned the official version of the incident as there were indications that the Valencian Government had tried to downplay the accident, which coincided with the visit of the pope to Valencia, or even to hide evidence, as the book of train breakdowns was never found. The day after the broadcast of this report, which received extensive media coverage, several voices called for the reopening of the investigation. The investigation was effectively reopened and the accident is currently under re-examination.
When did El Mundo's article with information about the crash investigation come out? (If the question is unanswerable, say "unanswerable")
March 2012