Identity theft. Warning from CRA

The following information is taken directly from the CRS website today:
The Canada Revenue Agency (CRA) is warning taxpayers to beware of a recent scam where some Canadians are receiving a letter fraudulently identified as coming from the CRA and asking for personal information. The letter is not from the CRA. View a copy of the letter here PDF version of the letter
The letter claims that there is “insufficient information” for the individual’s tax return and that in order to receive any “claims,” they will have to update their records. The letter attaches a form specifically requesting the individual’s personal information in writing, via fax or email, including information on bank accounts and passports. This letter is not from the CRA and Canadians should not provide their personal information to the sender.
All taxpayers should be vigilant when divulging any confidential information to third parties. The CRA has well established practices to protect the confidentiality of taxpayers’ information.
The CRA has notified the proper law enforcement authorities of this scam.