Mexican authorities say they have found the second flight data recorder from the airplane crash that killed Interior Minister Juan Camilo Mourino.

Transportation Minister Luis Tellez says Thursday that investigators found the "black box" containing voice recordings of the crew.  The data recorder with navigation information was recovered on Wednesday. 

Tellez says both boxes will be examined in the United States.

The small government plane crashed Tuesday during evening rush hour near Mexico's City's main avenue, Paseo de la Reforma.  Among those killed was the former prosecutor for drug crimes, Jose Luis Santiago Vasconcelos, and at least a dozen other people in the aircraft and on the ground. 

Interior Minister Mourino had led a government campaign against mounting violence by drug cartels.  The violence has killed about 4,000 people this year, including several top officials.

Some information for this report was provided by AP and Reuters.