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I googled Minnesota UFO and searched by date. This article cited the thread from yesterday. One of the comments says there was an RAF C17 that flew out of MSP in the afternoon.
Kind of looks like a light grey diamond. http://i.imgur.com/xxQum3o.jpg if that thing snuck up slow and low, could turn some heads and cause confusion.
I'm not all internetty, but maybe someone can look up flights from MLP. I didn't put much stock in that story anyways, what with the no reply from OP and all…. but nice to make sense of things. See how a story can get legs and deceive.