U.S. Air Force/Staff Sgt. Kenny Holston
A suspicious letter was opened at Joint Base Myer-Henderson Hall in Virginia on Tuesday that caused 11 people to suddenly feel ill.
Three Marines were hospitalized but were released late Tuesday night.
The building has also been cleared and is operational.
The letter has been sent to an FBI lab in Quantico for further study, and the FBI and NCIS will conduct a joint investigation into the incident.
The Marine Corps confirmed Wednesday that Joint Base...