The cemetery was evacuated as teams from multiple law enforcement agencies investigated around 9 a.m.
Up to 30 funerals a day are held on weekdays at the cemetery, where hearses lined up awaiting the all-clear.
A statement posted to the cemetery's website as of 1 p.m. read:
Arlington National Cemetery officials and Joint Base Myer Henderson-Hall emergency services are currently responding to a bomb threat. The cemetery is closed to the general public and funeral services have been delayed until further notice. The cemetery's response teams and local law enforcement partners are on site investigating the threat. The public is requested to avoid the area and wait for updates posted to our social media platforms.
Want breaking news in the DMV as it happens, or want to contribute? Join the DMV All Incidents Facebook group.
Click here to follow Daily Voice Gaithersburg and receive free news updates.