fraudster called TWICE w/in minutes of each call, thus intentionally targeted. 47-second recorded message begins in progress with:
"Marcus Brown and I'm calling from Criminal Investigation division of (pause then) IRS (spelled out slowly). the matter as of hand is extremely time sensitive and urgent (pause) because after audit we found that there was a fraud and misconduct on your tax which you are hiding from the federal government. this need to be rectified immediately so do return the call immediately as soon as you receive the message. the number is 7035318588. thank you.

DID NOT phone this clown back, immediately filed report with various law enforcement agencies including FBI and phishing@irs.gov. the callerID was first clue AND IRS doesn't make phone calls, you're notified in writing

Hi, my name is officer Marcus Brown and I am calling from criminal investigation division of irs.  The matter at the hand is extremely time sensitive and urgent as after all of it we found that there was a fraud and misconduct on your tax.  Which you are hiding from the federal government this needs to be rectified mediate.  Lee so do return the call as soon as you receive the message the number is 703-531-8588.  I repeat again 703-531-8588.  Thank you.