Some 60,000 absentee ballots were despatched by authorities in Broward County, north of Miami, this month.

However, only 2,000 of them have been delivered.

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Broward County election official Gisela Salas said the situation was "something beyond our control".

"We really have no idea what's going on," she told the Associated Press news agency.

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"It looks like they're trying to steal the vote again," said Diane Glasser, vice-chairwoman of the Florida Democratic Party.