First audio from EgyptAir flight released The first audio available from EgyptAir Flight 804 indicates that all was routine as the plane checked in with air traffic controllers in Zurich, Switzerland, late Wednesday night, before being handed over to Italian air traffic controllers in Padua (Padova). Sylvain Prevost, who trains Paris airport personnel, says cleaning staff are trained to alert authorities to suspicious items but specialized security personnel are not routinely required to sweep a plane after the cleaning crew leaves. In an email to The Associated Press, he noted that rules vary from airport to airport and said he was not aware of the procedures used when the EgyptAir plane was parked in Paris' Charles de Gaulle airport. A senior official at the Egyptian Civil Aviation Ministry has denied media reports that EgyptAir Flight 804's cockpit voice and flight data recorders, commonly known as the black boxes, have been located. Prior to boarding, the AP reporter says security checks Saturday afternoon at the Charles de Gaulle airport seemed normal, with no overt signs of addition security measures. The French air accident investigation agency says smoke was detected in multiple places in the EgyptAir Flight 804 before it crashed in the Mediterranean, but the cause remains unclear. Spokesman Sebastien Barthe told The Associated Press that the plane's automatic detection system sent messages indicating smoke a few minutes before it disappeared from radar. Search crews are scouring for further wreckage of EgyptAir flight 804 —including for the plane's black boxes, which could provide vital clues to why the jetliner crashed killing all 66 on board. Planes and vessels from Egypt and five other countries are searching a wide area of the Mediterranean Saturday, a day after the Egyptian army found debris from the Airbus 320 in the sea 180 miles (290 kilometers) north of Alexandria.