6:45 AM PT -- Police have ended the lockdown. Cops say an employee had passed through security with an item in a backup that appeared to be a weapon.
Once they determined it was not ... everything went back to normal.
The U.S. Capitol is on lockdown while police search for an individual -- possibly armed -- and people already in the building have been told to take shelter.
According to law enforcement there was a report of a person with a gun in a subway near Capitol. It's unclear if the person has actually entered the Capitol.
Right now authorities are saying the lockdown is being done out of "an abundance of caution."
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