The dramatic collapse of a rail overpass in Mexico City that killed at least 24 people has dealt a blow to two of President Andres Manuel Lopez Obrador's most senior aides, who are widely viewed as the leading candidates to succeed him.
Monday night's accident has stirred up concern about the city's infrastructure, in particular Linea 12, the metro line where the collapse occurred, and a flagship project of Foreign Minister Marcelo Ebrard when he was mayor . . .
