Investigators are looking into an apparent hazmat situation at Joint Base Myer-Henderson Hall in Ft. Myer, Virginia, after a number of people began feeling sick after opening a letter, officials said.
Arlington Fire, one of the units responding to the scene, said “11 people started feeling ill after the letter was opened” in an administration building. Three patients were hospitalized and were said to be in stable condition.
According to the U.S. Marines, personnel took “preventative measures” and evacuated people from the building.
“Several Marines are receiving medical care as a result of this incident,” they added.
The suspicious substance has been bagged by authorities and the FBI is making their way to the scene, officials said.