They claim to be IRS. It's physhing or spam. Hang up immediately, it's bogus!

Beware of calls from this number. They're claiming to be an IRS agent threatening to report you to the sheriff's department. They don't give you a reason why. I suspect that this is part of a scam like this one http://www.irs.gov/uac/Newsroom/IRS-Renews-Phone-Scam-Warning

240 547 2488 is an IRS scam. The individual began calling me a [***] and telling me I wanted to [***] after I called him out on the scam. Level 3 Communications has been informed of the issue with this number, as well as, the Prince George's County Police Department. Level 3 Communications did not seem very motivated to discontinue this number which is directly associated with their organization. The publicly traded stock company is proving why it is a horribly run organization for investing anyone's time and money. The initial agent I spoke with a Level 3 Communication (Jeffery Montoya) was extremely condescending insisting he was going to control the conversation and refusing initially to reveal his name.

SCAM. They should be arrested for pretending to be a government agency and threatening people