The helicopter had been carrying cash for a local bank on the way out and was returning with passengers to Tripoli.
According to local media, the dead may include high-ranking militia members. Bank workers were also reportedly on board.
The civilian bank staff were from the town of Surman, a militia spokesman said.
Libya has been hit by instability since the overthrow of Muammar Gaddafi in 2011, with numerous militias each governing their own patches of territory.
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