A suspicious letter caused a street closure in downtown D.C. Monday evening.
A letter with an unknown substance arrived at Amorini Panini in Northwest about 5:45 p.m., according to D.C. fire. F Street was closed between Ninth and 10th streets.
A hazmat team responded, and the letter was taken to a lab for further analysis.
No one was hospitalized. The scene has since been cleared.
The FBI is investigating.