Sounds like Islamic terrorists and Ohio has had a number of busts of Islamic terrorist-types. As for attacks, I think there was a minor one at some Middle East Restuarant, I forget where in Ohio, I know I could find it. Lone wolf type of deal, maybe nobody was killed.
That was in Columbus, too. Near Gahanna.
I think the restaurant was called Nazareth. It was near where I used to live.