Volunteers and National Park Service rangers on Saturday discovered a “light, oily” substance on the memorial’s wall panels and the paving stones in front of it, Bill Line, a Park Service spokesman, said yesterday.
The substance, which has not been identified, was spread over an area of about 50 to 60 feet, mostly on the paving stones, Mr. Line said.
The article states that they’re not sure if the substance was intentionally spread, but when I look at the photos taken by Rob Bluey, it’s hard to imagine it being accidental.
h/t: Baldilocks, who got it from Red State