Found multiple reports during the past hour from others, listed on the Mr. Number site, that this is a scam claiming to be the Treasury Dept. and that the called party was told they had a warrant for a criminal case arrest because they failed to pay sufficient taxes in 2010. One party called the IRS and Treasury Dept. about this and was told it is a verified scam, and that they IRS or Treasury Dept. doesn't use phone calls to reach people when they need to.