US election officials believe they have uncovered massive attempted voter fraud less than a month before the country goes to the polls to choose its new president.

Eleven separate investigations have now been launched into a voter registration group called the Association of Community Organisations for Reform – or Acorn.

The authorities believe they may have duplicated voter forms, employed convicts to register people and even stolen the names of the American football team the Dallas Cowboys in order to create fake voters.

The suspicions started when authorities in Las Vegas raided the organisation's offices, removing eight computer hard drives and several boxes of documents.

Acorn called the raid "a stunt that serves no useful purpose other than discredit our work".

They suggested the investigations into them were politically motivated.

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