The man splashed red paint and wrote a profane message on the bottom of the Washington, DC monument, police mentioned.
Park Police are not sure at the moment if the momentary closure will have an effect on public visitation of the monument which might usually reopen at 10:00 am the next day.
After years of development and repairs, the Washington Monument reopens to the general public.
Repairs and cleansing of the paint will likely be dealt with by National Park Service conservators.
The iconic construction on the National Mall is called for George Washington, the nation’s first president.
The obelisk was accomplished in 1888.