This is a scam; the Internal Revenue Service (IRS) does not have anything to do with the individuals that are impersonating IRS employees. The IRS does not contact taxpayers via telephone demanding payment and/or threatening to arrest taxpayers.
Got call this morning as driving to work, claiming to be IRS as posted above.
After talking to them for a while, got to the point that it is severe scam as notified by IRS.gov.
I received a voicemail messages claiming to be IRS collector this morning at 9:30am. Cannot believe this number is listed here on the web by other folks. Beware of this caller!