PORTLAND, Ore. (AP) -- A powder that sickened six employees of a Portland hospital has tested negative for dangerous substances.
FBI spokeswoman Beth Anne Steele says the tests conducted Thursday haven't yet determined what the powder was, but investigators compared it to common dangerous agents and didn't find a match.
Four employees at the Portland Veterans Affairs Medical Center's administrative building and two security workers were affected after an envelope containing the powder was opened Wednesday afternoon.
Spokesman Mike McAleer says "a little soap and water was needed to end the irritation," and most of the employees were back at work Thursday.
The main hospital was unaffected.