I received a call from this number this morning on my cell phone who claimed to be an IRS Representative advising me that I am being audited and that there is a warrant for my arrest issued due to my lack of response.  They had a court number and gave a IRS badge number and name Shawn Morris.  Court ID IR 621730.  Heavy accent and very bad connection.  It was obviously a scam.  I didn't let it get far enough for them to even request whatever they were going to request.  I could see how this would be scary though as they were very persistent and threatening.

Scam IRS call demanding immediate MoneyGram payment to avoid arrest.

Received a cal from this number claiming to be the IRS Investigation Department.  They indicated that I failed to respond to CP2000 and CP11A notices and that a warrant was being put out for my arrest.  Bad connection and accent - search indicates it is a Sprint cell phone in Brooklyn.  Did not demand information or cash, but did threaten arrest, fines, etc.  Suspect there will be a follow up call to send cash to avoid arrest based on above comments.

Did not get a badge number but they indicated that I failed to respond to CP2000 and CP11A notices - which are real documents.  Did not request any information but threatened arrest, fines, etc.

Official IRS Government site detailing this scam and providing links to report it:
http://www.irs.gov/uac/Newsroom/IRS-Warns-of-Pervasive-Telephone-Scam

If you feel you SSN has been compromised, in addition to putting a fraud alert at the 3 credit bureaus, you may want to notify the IRS.  Here is the link, fill out the proper form (probably 14039):
http://www.irs.gov/Individuals/How-Do-You-Rep ... aud-Activity%3F