What does it mean?!

The Lincoln Memorial in Washington, D.C., was vandalized sometime late Thursday night with green paint.

Via: J. Scott Applewhite / AP

The culprits didn't leave any messages or symbols, authorities said.

Via: J. Scott Applewhite / AP

The memorial will stay closed until National Park Service crews can take care of the mess — likely sometime later on Friday.

Via: J. Scott Applewhite / AP