French investigators say the final report into the causes of the crash of Air France flight 447 will soon be published, three years after the jet went down in the mid-Atlantic killing all 228 people aboard.

France's accident investigation agency, or BEA, said in a statement Wednesday that the final report will be released at a news conference on July 5.

A preliminary report released last July highlighted a chaotic cockpit scenario before the crash, with a confused crew getting incoherent speed readings from faulty sensors, but it didn't draw a conclusion on whether pilot error, equipment failure or other unknown factors caused the crash.

The Airbus 330 passenger jet flying from Rio de Janeiro to Paris crashed on June 1, 2009.