The headquarters of the Republican National Committee were put on lockdown Wednesday morning.

It was unclear exactly what caused the security alert, but one source told The Post: “It&nbsp;sounds like vials of blood were sent in a package and something broke open.”

There were no immediate reports&nbsp;of any injuries.

A Hazmat unit was on site at the Capitol Hill building.

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The headquarters of the Republican National Committee were put on lockdown Wednesday morning. It was unclear exactly what caused the security alert, but one source told The Post: “It sounds like vi…{ai:summary}<p>Republican headquarters on lockdown over mysterious package with broken vials of blood. Hazmat unit called in, no injuries reported. #politics</p>

RNC headquarters in DC on lockdown after ‘vials of blood’ reportedly sent in package

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