INVESTIGATORS are sifting through the wreckage of the Air France Concorde to determine what started the fire that caused it to crash moments after takeoff killing 109 people on board and four on the ground. This is the first major accident since the supersonic craft was first launched 31 years ago. The French ministry of Transportation said that the two black boxes from the aircraft had been found, but were damaged in the crash. Experts have said that possible cause of the crash was engine problems, but they will also be investigating issues such as birds flying into the air intake and possible mechanical failure. Witnesses said they saw a plume of flame trailing some 60 metres behind the plane shortly before it crashed. Meanwhile French authorities are examining the charred bodies of the 113 victims that died in the crash to determine their identities as relatives prepare to fly to France.