The Postal Inspection Service says tests of suspicious mail sent to the Phoenix office of U.S. Sen. Jeff Flake have found nothing dangerous or harmful.
Authorities evacuated part of the building Wednesday after staff for the Republican senator came across mail that was stained with an oily substance. But Keith Moore of the Postal Inspection Service says a letter was tested and found to be harmless.
The situation came a day after authorities said a letter containing ricin was mailed to the office of a Mississippi senator. The Secret Service also says it has intercepted a letter addressed to President Barack Obama that contained a substance that tested positive for the poisonous ricin.