Vulgar message mysteriously posted to traffic sign

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ST. LOUIS, MO (KTVI) - A possible hack attack that MoDOT Is calling a mystery.

MoDOT says someone placed an electronic message board with a vulgar message overnight along hwy 367 northbound at Lindbergh. Several FOX 2 viewers snapped pictures of the message before it was taken down--

Here's the mystery: MoDOT officials say the sign did not belong to them.