The head of a team probing a crash which killed 117 people in Nigeria last month said on Thursday the aircraft's black boxes have not been found and may have been destroyed when the plane slammed into the ground.
Angus Ozoka, the head of Nigeria's accident investigation and prevention bureau, would not say how much longer the investigation into the October 22 Bellview Airlines crash could last.
There has been little indication of what could have caused the crash, although some aviation experts have said the plane may have been downed by lightning.
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