A former Memphis police officer was arrested and is facing several charges after at least nine weapons were found in his auto near the White House, The Washington Post reported.
In a statement Monday, the Secret Service said Bates approached several officers at 17th Street and Pennsylvania Avenue NW at 7:15 a.m.
The encounter with Bates resulted in the officers taking "investigative action", police say.
In his vehicle, officers found nine guns, three knives, brass knuckles, ammunition and more.
The plates had a Fraternal Order of Police insignia on them; it could not immediately be determined if the suspect has a connection to law enforcement.
Bates was an officer with the city in 2000 and retired in August of 2013. Police said he faces charges that include illegal possession of firearms, illegal transportation of firearms and other gun offenses.
Secret Service refused to comment further and declined to identify the suspect.
Metro D.C. Police charged Bates with six counts, including possession of a prohibited weapon; possession of an unregistered firearm; possession of unregistered ammunition; carrying a unsafe weapon outside a home or place of business; carrying a pistol without a license; and unlawful transportation of a firearm.