The National Park Service has determined that the liner of the Lincoln Memorial Reflecting Pool on the National Mall was deliberately cut with a sharp object, such as a knife or razor blade, according to officials. The conclusion rules out accidental damage or normal deterioration as the cause of the liner's failure and opens the possibility of a criminal investigation into the act of vandalism.

The damaged liner has significantly complicated an ongoing renovation project at the site. Officials have indicated the deliberate sabotage could drive up repair costs and extend the timeline for restoring the Reflecting Pool, which has been partially drained as part of broader infrastructure work. Congressional leaders have been briefed on the situation, with questions arising about who will bear the added financial burden.

The Reflecting Pool renovation is part of a larger set of improvements to Washington's monumental core that have drawn attention from the Trump administration. The sabotage finding adds an unexpected dimension to what was already a high-profile and costly infrastructure undertaking, with some lawmakers pressing for accountability over the escalating expenses.

No suspects have been publicly identified, and it remains unclear when the cut was made or discovered. The National Park Service has not released details about what evidence led investigators to conclude the damage was intentional, nor has it specified which law enforcement agency is leading any criminal inquiry. The pool is one of the most visited landmarks in the United States, situated between the Lincoln Memorial and the Washington Monument.