Mexican billionaire Carlos Slim's construction arm Grupo Carso faces scrutiny from accident investigators for the possible role it played in the building of a metro railway line that collapsed this month, killing 26 people.
While no officials have blamed Carso or any of the other companies involved in the construction of the line for the accident, the Mexico City attorney general's office said the probe it is leading would encompass everything from design and construction of the metro's Line 12, the materials used, and cost overruns.
Inquiries will reach "wherever the investigation . . .
