Police are investigating the unauthorized use of about 3 million citizens¡¯ personal data in Alberta, the oil-rich Canadian province that appears headed toward a referendum on independence.

An activist group called the Centurion Project is accused of unauthorized possession of Alberta¡¯s list of electors, which contains names, addresses and other personal information of voters. The dataset comprises about three-fifths of the province¡¯s population, according to Elections Alberta.

That agency believes the Centurion Project obtained the data from the Republican Party of Alberta ¡ª a minor political party that supports Alberta¡¯s secession from Canada. Investigators have started a probe in response to concerns about ¡°potential misuse¡± of the voter list, according to the Royal Canadian Mounted Police.