CENTER CITY (WPVI) --A threatening letter was sent to the sister of presidential candidate Donald Trump on Friday.
Judge Maryanne Trump Barry sits on the U.S. Circuit Court of Appeals for the 3rd Circuit, which is based in Center City.
The FBI Philadelphia branch issued the following statement:
"The FBI is aware of the incident and is working closely with the United States Secret Service and U.S. Marshals Service. As it is an ongoing matter, no further details are available at this time."