Police got a call from a tourist around 1:30 a.m. Friday about the vandalism. The Lincoln Memorial, which is open 24 hours, 7 days a week, is now closed while police investigate and the National Park Service maintenance crew cleans it up.
No words, letters or symbols were visible in the paint, but Capt. Steven Booker says the paint spill "appears intentional based off of the splatter." He says police are reviewing security camera footage to try to identify possible suspects.
Officials are reviewing surveillance video from the area, according to WJLA.com.
The memorial, one of the most popular sites on the National Mall, was dedicated in 1922 to the nation's 16th president.