The numbers “8647” — a phrase generally used to signal opposition to President Donald Trump — appeared etched into the grass on the National Mall on Thursday, days before massive crowds are expected in the area for a UFC match on Trump’s birthday on Sunday.

Trump’s “Freedom 250” celebration in D.C. is off to a great start.

The U.S. Park Police is reportedly investigating the marks, which appeared Thursday.

A large etching of what appears to be the numbers "8647" have appeared on the National Mall nearby the Washington Monument.