Lockdown procedures were implemented at the Republican National Committee offices in Washington, DC, following reports of suspicious material discovered that appeared to be blood bottles.
The New York Post reports that at around 9.40 am, the all-clear was granted following the entry of a hazmat crew into the building.
The US House office buildings are located just across the street from the headquarters. There were no reported injuries.
NBC News reports that many vials of blood were sent to the headquarters.