Black boxes from crash that killed Brazil candidate don't have flight recording: Air Force

Officials work at the crash site of a small plane that was carrying Brazilian presidential candidate Eduardo Campos and several campaign officials, in the port city of Santos, Brazil, Wednesday, Aug. 13, 2014. All seven people aboard the plane, including a campaign photographer and press advisor, as well as two pilots, died in the crash, City Hall press officer Patricia Fagueiro confirmed. (AP Photo/Nelson Antoine) (The Associated Press)

In this July 29, 2014 photo released by the Partido Socialista Brasilero, PSB, Brazilian presidential candidate Eduardo Campos, poses for a photo with a supporter, during a campaign rally, in Osasco, Brazil. The PSB presidential candidate died Wednesday, Aug. 13, 2014, when the small plane that was carrying him and several campaign officials plunged into a residential neighborhood in the port city of Santos, a City Hall official there said. (AP Photo/Partido Socialista Brasilero) (The Associated Press)

RIO DE JANEIRO – Brazil's Air Force says the black box recovered from the wreckage of the plane crash that killed a presidential candidate does not contain a recording of the flight.

The Air Force says the black box contains two hours of recordings, but not from Wednesday's fatal flight, which killed Socialist candidate Eduardo Campos and six others. It says the reason behind the discrepancy will be investigated.

Friday's statement emphasizes that the lack of recordings doesn't doom efforts to find the causes of the accident, saying the black box represents "just one element" of the investigation.

The crash threw Brazil's presidential race into turmoil less than two months ahead of the Oct. 4 race. Campos was polling in third place, behind incumbent President Dilma Rousseff.