Not much info right now, but MSNBC is reporting that two people have been stretchered out and others are receiving decontamination showers by Hazmat crews and the FBI.
OGDEN, Utah - Hazardous materials crews and the FBI were on the scene Monday at the IRS building in Ogden, Utah, where two people were removed on stretchers and several others were undergoing decontamination showers.
The FBI released no information about the incident. The IRS said "an unknown substance" was discovered but gave no further details; local news reports suggested that a suspicious white powder may have been found in mail delivered to the facility.
Sorry, not much more news and in fact the news is only on the website and not the network.
Update
KSL in Utah has footage up of the two people being removed.
Update II: 5pm
CNN is reporting that a questionable powdered substance was discovered.
Sorry I don't have more but there is little coverage on the networks if any at all right now.
Update 11pm
AP reporting the substance was non hazardous
Christ almighty with the moaning on here about a diary not being updated when people may just have other commitments beyond sitting at their PC for hours.