The Secret Service says an envelope addressed to the White House has tentatively tested positive for cyanide.
The FBI says a letter sent to the Department of Agriculture had no threats and was not a hazard. Agents on Tuesday investigated a report of a suspicious letter at the building at 14th Street and Independence Avenue in southwest.
After nearly three hours at work, Morris Hall brushed his fingers over a cabinet of sorting cubbies to make sure he didn’t overlook a stray envelope. He was about to head out of the Postal Service plant off Riva Road to begin his day.