An IRS building in Ogden, Utah, is on lockdown after hazardous-material teams were called in earlier today, reports the Standard-Examiner. FBI officials confirmed that they are investigating the situation. Two people in the building were also treated for medical emergencies, but officials said those were unrelated to the suspicious substance found. The past year has seen a 21.5 percent rise in threats against IRS employees. Last month, a man crashed his plane into an IRS building in Austin, Texas, after leaving behind an anti-tax manifesto.