(WASHINGTON, D.C. (My TV20 News at 10) --- Some aides to U.S. Senator Carl Levin are breathing a little easier.
The suspicious letter that arrived at his Saginaw office has tested negative for anything harmful.
That's the word from the senator.
The letter forced the evacuation Wednesday.
Investigators are still trying to find out if it's connected to other letters sent to President Obama and Mississippi Senator Roger Wicker.
They tested for the poison ricin.
All the letters did not have a return address.