The Republican National Committee headquarters in Washington, D.C., was put on lockdown Wednesday morning after someone sent vials of blood into the building. three sources familiar with the matter told NBC News.
Capitol Police responded to the scene at 7:45 a.m. after reports of a suspicious package, police said.
The package contained two vials of blood and was cleared by the Hazardous Incident Response Division, police told NBC News. The source of the package and its contents are under investigation.
It is unclear if a suspect is in custody.
The road leading to RNC headquarters was later reopened to traffic and Capitol Police left the scene.
