MH370 search: Doubts over 'debris burn marks'

Australian authorities have cast doubt on the theory that Malaysia Airlines flight MH370 may have had a fire on board before it went missing. Earlier this month, pieces of debris appearing to show burn marks were recovered in Madagascar. However, authorities say there is no evidence yet that the debris came from MH370 - and the dark marks were caused by resin on the debris, not fire. The 5 fragments had been found by debris hunter Blaine Gibson, who has previously found other parts of the plane. Two of the pieces appeared to show burn marks, which, experts said, could provide more information on what happened to flight MH370 if confirmed. However, Australian Transport minister Darren Chester said Thursday that an initial investigation showed that "contrary to speculation there is no evidence the item was exposed to heat or fire". <br/>