OTTAWA - The Canada Revenue Agency has offered credit-protection services to several people after their private information -- including social insurance numbers and addresses -- was mailed to others.

The federal privacy commissioner's office says it is investigating the violations, first flagged by constituents of New Democrat MP Charlie Angus.

Angus says the revenue agency twice sent batches of personal data to the wrong people in his northern Ontario riding.

In a letter to the commissioner's office, Angus says the revenue agency mailed a package April 6 to several constituents in Kirkland Lake, Ont., containing the names, SINs, addresses and phone numbers of five people.

Five days later, the same constituents were mailed a second package with similar personal information about 11 people.

Revenue agency spokesman Philippe Brideau says the agency contacted the privacy commissioner after confirming the breach, informed the affected people and made no-cost credit protection services available to them.