The Tomasetti probe found that the stage was so poorly built that the concrete anchors that secured it started sliding when winds hit 33 mph. The anchors should have been able to withstand winds up to 68 mph, Tomasetti officials said.

Even if the four large barriers had stood their ground, the wires connecting them with the stage -- and the latches to the stage -- would have given way eventually.

Scott Nacheman, a vice president at Tomasetti, said the so-called "Jersey barriers" -- familiar to motorists as highway barricades -- slid from a couple of inches to 10 feet.
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