DALLAS, Dec. 12 (UPI) -- More than 30 envelopes containing white powder have been mailed to governors' offices around the United States this week, the FBI said Friday.
The envelopes have also contained notes, Robert E. Casey Jr., special agent in charge in Dallas, said. All were postmarked in Texas.
After field screening, the powder has been sent to laboratories for testing.
"It's likely there will be more," the FBI said in a statement. "These letters are all similar in nature."
The Utah Capitol was evacuated for several hours Thursday after one of the envelopes arrived at Gov. Jon Huntsman's office. On Friday, Idaho Gov. C.L. Otter received one, the Deseret News reported.
White powder hoaxes have become common since 2001, when several people died after letters containing anthrax spores were mailed to members of Congress and several news organizations. But Casey said that even hoaxes can have "severe consequences" by draining emergency resources.
