BELLEVUE – The FBI is investigating after envelopes containing white powder showed up in government offices from Seattle to Boise. In Bellevue, a building with offices of the Internal Revenue Service was evacuated around 12:30 p.m. A female worker said she opened an envelope in the mailroom and white powder "poofed" out. "One worker was directly exposed and another worker was close enough nearby to be concerned. We've taken both of them to the hospital," said Lt. Eric Keenan of the Bellevue Fire Dept. Federal and local investigators converged on the four-story building. While Port of Seattle bomb dogs searched...