Mexican police are searching for the people responsible for kidnapping the two top traffic officials in the northern city of Monterrey.
Enrique Barrios Rodriguez was kidnapped early Monday morning when armed assailants rammed through the front gate of his home.
It was just a day after his operations chief, Reynaldo Ramos, was abducted from his home nearby.
Monterrey Mayor Fernando Larrazabal said the motive was not yet known. He said the state prosecutor's office is handling the investigation.
Monterrey is the capital of the Mexican state of Nuevo Leon, which has experienced a recent increase in drug-related violence.
The mayor has recently fired a large number of traffic police officers suspected of corruption or collusion with drug traffickers.
Some information for this report was provided by AP, AFP and Reuters.