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EXCERPT:
It was unclear how the markings in the grass were made. In some areas, the grass turned brown to form the shape of numbers in contrast to the surrounding green.
The US Park Police said the cause of the “discolouration” has not yet been determined. A spokesperson said grass samples have been collected for testing and an investigation is ongoing.
The White House referred questions about the incident to the Department of the Interior. The incident comes as the National Mall is set to be the scene for events celebrating the 250th anniversary of US independence in the coming weeks.