According to the Washington Post, the number of threats being made against Internal  Revenue Service employees has been rapidly climbing since the incident  last month when a plane flew into an IRS office. The pilot and one IRS  employee died in the crash, and since then the IRS has investigated  more then 70 reported instances of a threats being made by taxpayers  to IRS workers.
Workers have received a mix of inappropriate  verbal comments -- including jokes or statements of support for pilot  A. Joseph Stack -- and more serious threats, claimed National Treasury  Employees Union President Colleen M. Kelley.
Kelley said she learned of the threats  from the Treasury Inspector General for Tax Administration, which tracks  threats against IRS workers. Neither TIGTA nor the IRS would confirm  the number of threats or share details of the probe.
 
"TIGTA is actively and aggressively  investigating all threats made against IRS employees, infrastructure  and property," said J. Russell George, the treasury inspector general  for tax administration. His office and the IRS have instructed workers  to report threats immediately. "It would be a little naive to think  that we don't get some threats over the course of doing business,"  said IRS Communications Director Terry Lemons.