A fast-moving phone scam called the largest of its kind is targeting taxpayers across the country, warns the Washington State Attorney General’s Office.

The scammers impersonate Internal Revenue Service (IRS) agents and demand payment for taxes owed, and often know the last four digits of the victim’s Social Security number, make caller ID appear as if the IRS is calling, send follow-up bogus IRS emails to support their scam; and call a second time claiming to be the police or Department of Motor Vehicles, and caller ID again supports their claim.

If you or a family member receives one of these calls, your best bet is to hang up. But if you do get into a conversation, do not give anyone money or credit card information over the phone and don’t trust callers who use threats to bully you.

Report the incident to the Treasury Inspector General for Tax Administration at 1-800-366-4484. File a complaint with the Federal Trade Commission at www.ftc.gov. Add “IRS Telephone Scam” to the comments.