An official with the U.S. Postal Inspection Service says a suspicious substance found at an IRS building in Ogden, Utah, is not hazardous.
The FBI's Salt Lake City division said Monday that hazardous materials crews were called to the IRS building about 35 miles north of Salt Lake City to respond to a possible hazardous material threat.
Parts of the building were evacuated.
U.S. Postal Inspection Service national spokesman Pete Rendina told The Associated Press the "matter was non-hazardous."
The FBI says some people had medical emergencies but that they did not appear related to the incident.
The incident began about 12:30 p.m. (2:30 p.m. ET) Monday, 11 days after a Texas man embroiled in a years-long dispute with the IRS crashed his small plane into the agency’s complex in Austin, Texas.