State police in Michigan are investigating after someone hacked into a digital road sign to post a racist message about Trayvon Martin, the Florida teen who was shot and killed by neighborhood watchman George Zimmerman, who claims he was acting in self-defense.

Motorists on Interstate 94 near Dearborn, Mich. reported seeing the message "Trayvon A N*gger" on the road sign overnight.

The message was displayed for more than an hour until workers were able to power down the sign.

"The portable sign has a panel that was broken into," Michigan Department of Transportation spokesman Rob Morosi said. "The message was changed and the keyboard was actually stolen."

To read more on this story, see the myFOXdetroit.com article here.