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The pair approached the President's official residence in their car on Saturday afternoon at around 5.24pm, and approached Secret Service officers 'on their own accord'.
Washington DC currently has a number of secured vehicle checkpoints in operation, and the two adults arrived at the one near to the western side of 15th Street and Pennsylvania Avenue North West.
The Secret Service later said that 'during the course of the encounter and subsequent arrests, the individuals posed no immediate danger to any Secret Service protectee'.
It's not known what was on the letter addressed to Biden, but - upon approaching the Secret Service officers - the woman immediately told them that she had a gun and was there to see Biden, and was arrested.
Her companion then also told the officers about another gun that was in a nearby vehicle, which was subsequently discovered after a search.
The police said the pair told them: "They were there to meet with the President of the United States and had a letter to deliver to him."
A spokesperson for the Secret Service told NBC4 Washington: "One of the individuals disclosed the possession of a weapon and was immediately detained and the second individual disclosed the location of an additional weapon in a vehicle nearby."
They added that the officers then 'took possession of the weapon'.
The unidentified man was arrested for possession of a BB gun, and a 66-year-old woman was arrested for carrying a pistol without a licence, as well as possession of an unregistered firearm and possession of unregistered ammunition.
A full Secret Service statement reads: ""On Feb. 13 at approximately 5:24 p.m., two individuals approached U.S. Secret Service Uniformed Division officers near 15th St. NW and Pennsylvania Ave.
"One of the individuals disclosed the possession of a weapon and was immediately detained and the second individual disclosed the location of an additional weapon in a vehicle nearby.
"Uniformed Division officers located the vehicle and took possession of the weapon.
"The first individual was arrested for possession of a BB gun and the second individual was arrested for carrying a pistol without a license, possession of an unregistered firearm and possession of unregistered ammunition.
"During the course of the encounter and subsequent arrests, the individuals posed no immediate danger to any Secret Service protectee."
Obviously, Washington DC is on high alert just now, given the events of 6 January.
Supporters of former President Donald Trump stormed the Capitol Building, leading to the evacuation of all the politicians inside who were set to vote on the ratification of the 3 November election, in which Trump was defeated by Biden.
Yesterday, the Senate failed to pass the 67 vote threshold necessary to convict Donald Trump of the incitement of that riot in his second impeachment trial.
Another incident similar to this one took place last month when 63-year-old Linda MaGovern was arrested for impersonating a law enforcement officer, fleeing a law enforcement officer, and failure to obey after she approached a similar DC checkpoint and told security that she was a member of Biden's cabinet before fleeing after she was asked to produce her licence.
LADbible has contacted the US Secret Service for comment.
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