The Continental DC-10 took off from the same runway minutes before the Concorde, which caught fire and crashed into a hotel, killing 113 people, said France's Accident and Inquiry Office.
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The Accident and Inquiry Office has not officially strung together the chain of events in the crash, which also included two failed motors and a problem with the landing gear.
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The French Accident and Inquiry Office said investigators were reconstructing the wreckage, examining the flight path and performance of the plane and studying the events that led to the crash.
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A spokeswoman for the French Accident and Inquiry Office said Wednesday the metal strip was part of a judicial inquiry into the crash and investigators could not release details of the probe.
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The French Accident and Inquiry Office also said in its report that six prior incidents in which burst tires had perforated Concorde fuel tanks had occurred between June 1979 and October 1993.
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In its report, the French Accident and Inquiry Office, or BEA, said investigators had uncovered new details to explain what caused the supersonic jet to crash near Paris on July 25, killing 113 people.
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So far, the Accident and Inquiry Office, which is part of the Transportation Ministry, has said that flames spewing from the side of the aircraft before it crashed most likely came from a major fuel leak.
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The Transport Ministry's Accident and Inquiry Office said seven work groups had been formed to focus on key elements of the investigation, including the wreckage, the aircraft's systems and engines, preparation for flight and eyewitness accounts.
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The French Accident and Inquiry Office, known as the BEA, also said in its report that six prior incidents in which burst tires perforated fuel tanks had occurred on Concordes between June 1979 and October 1993.
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"The flames seen after takeoff did not come from the engine, but, in all likelihood, from a major fuel leak, " the Accident and Inquiry Office, part of France's transportation ministry, said in a statement Sunday.