The Information Commissioner is launching an investigation after the Conservatives accidentally sent details of 8,000 people to a radio station.
The e-mail sent contained the names, addresses, telephone numbers and intentions of voters in the Crewe and Nantwich by-election.
Deputy Information Commissioner David Smith said the disclosure, to Manx Radio, raised "serious concern".
The Conservatives admitted a "mistake" had been made.
Files deleted
The information, which had been gathered by the Tories during the campaign for Thursday's by-election, was contained in three Excel files, and was sent in an e-mail to Manx Radio by accident, potentially breaching data protection laws.
The e-mail was received by the radio station at lunchtime on Wednesday.
It sent it on to the local newspaper in Crewe, although it is understood that both emails have now been deleted.
via BBC NEWS
The e-mail sent contained the names, addresses, telephone numbers and intentions of voters in the Crewe and Nantwich by-election.
Deputy Information Commissioner David Smith said the disclosure, to Manx Radio, raised "serious concern".
The Conservatives admitted a "mistake" had been made.
Files deleted
The information, which had been gathered by the Tories during the campaign for Thursday's by-election, was contained in three Excel files, and was sent in an e-mail to Manx Radio by accident, potentially breaching data protection laws.
The e-mail was received by the radio station at lunchtime on Wednesday.
It sent it on to the local newspaper in Crewe, although it is understood that both emails have now been deleted.
via BBC NEWS
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