The Lincoln Memorial in Washington, D.C., was vandalized sometime late Thursday night with green paint.
The culprits didn't leave any messages or symbols, authorities said.
The memorial will stay closed until National Park Service crews can take care of the mess — likely sometime later on Friday.
Jessica Testa is a national reporter for BuzzFeed News and is based in New York.
Contact Jessica Testa at firstname.lastname@example.org.
Got a confidential tip? Submit it here.