The numbers “86 47” were found carved into a section of grass on the National Mall on Thursday, days before large crowds are expected to gather in Washington, D.C., for a UFC event scheduled on President Donald Trump’s birthday.

Live webcam footage from the showed the numbers cut into a large patch of discolored grass east of the World War II Memorial. Officials have not determined when the markings were made. Photographs of the National Mall taken on June 5 did not show the numbers.

The markings were not easily visible from ground level Thursday afternoon. Witnesses said several emergency vehicles blocked off the area around 1:00 p.m. while…

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