Michigan road sign hacked with racist message about Trayvon Martin

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."

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