Mexican law enforcement authorities are investigating a former president, Enrique Pena Nieto, as part of an inquiry into corruption, the Wall Street Journal reported on Wednesday.
Pena Nieto has become embroiled in the investigation of Emilio Lozoya, the former chief executive of Mexico's state oil firm Petróleos Mexicanos, or Pemex.
Lozoya is accused of corruption related to a wide-ranging bribery and money-laundering case involving Brazilian construction firm Odebrecht SA. Lozoya, who was arrested in
Spain last week, has denied wrongdoing.