I bet the student was of Norwegian descent.
Remember we are still in the foggy period. I bet you even the TV guy really doesn't know what has really happened 30 minutes after this thing has gone off.
Let's wait for about 4-8 more hours.
I haven't heard about a 2nd device. Hope it's not true... just relaying what I heard.
2 devices is no prank.
If I were trying to clear a stadium with thousands of spectators and was trying to avoid a stampede panic, I'd probably go with the "it's a suicide" theory...move along nothing to see...