Markings depicting the numbers 8647 or 86 47 appeared in the grass on the National Mall in Washington, D.C., on June 11 near the World War II Memorial. U.S. Park Police responded to a report of possible vandalism, collected grass samples, and an Interior Department spokesperson described the incident as deranged vandalism while stating that any threat against the president is taken seriously. The cause of the discoloration remains undetermined, with observations reported by a Reuters photographer from the Washington Monument.