An investigation is under way to find out who spray-painted green over the large gold "M" on the Diag on campus at the University of Michigan.
We're told it happened sometime early this morning.
The sports editor of the Michigan Daily sent out a tweet of the damage.
Someone spray-painted the “M” green and added an "S" and a "U" in white.
Michigan and Michigan State are set to renew their rivalry this Saturday in East Lansing at 3:30.