The Republican National Committee headquarters in Washington was briefly locked down Wednesday morning after a package containing two vials of blood was discovered.

A hazardous materials team from the Capitol Police responded just before 8 a.m. about a report of a suspicious package.

The package was cleared by our Hazardous Incident Response Division, a spokesperson for the Capitol Police said in a statement. It contained two vials of blood. The source of the package and its contents will be further investigated.

The package was addressed to ex-President Donald Trump , according to the Associated Press.

After securing the package, a lockdown in the building was lifted and Capitol Police left the scene.