Scammer leaves message on answering machine claiming to be "United States Treasury"......When you call they threaten your arrest for back taxes. Sounds Nigerian and very hard to understand.
The same as others, said I owed money for my 2010 tax return and it had been forwarded to them for collection before I had to go to a magistrate. When I asked him why they didn't send a form to me about this matter he said that they had sent it twice. When I let him know that I have worked with an IRS agent in the past to clear up my tax matters and there was nothing wrong with my 2010 return he hung up. He also had a foreign accent and I could hear many other callers in the background.
The IRS does not call people, they send letters. First Class, if you ignore those, they send certified that you must sign for. After that they freeze your bank accounts.
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
The criminal on the other end left a message and said the IRS is after someone (of course the POS didn't even know who he was calling) and we need to call him back and he will help us not get arrested! For a fee I'm sure