Authorities are investigating a suspicious substance in an envelope after three Marines were hospitalized at Joint Base Myer-Henderson Hall in Arlingon, Va., on Tuesday.
After the envelope was opened around 3 p.m., 11 people began to feel ill. The building was evacuated, according to a statement by base officials.
Following an evaluation of the 11 personnel, three were transported to a hospital for further medical evaluations. All three were released at approximately 10 p.m.