A liner along the bottom of the Lincoln Memorial Reflecting Pool was cut with a sharp knife or razor this month, causing damage to the foam sealant installed as part of a $16 million rehabilitation project, a top official at the National Park Service says.

The agency reported the June 9 incident to U.S. Park Police, said Frank Lands, deputy director of operations for the park service.

Lands made the statement in a court document filed late Wednesday as part of a lawsuit filed by a nonprofit organization to halt the Trump administration's work on the project.