The British pound dropped sharply against the U.S. dollar Thursday, as the greenback moved higher against other major currencies. The U.S. dollar index surged higher following the mystery move. Traders could not immediately pinpoint a specific reason for the moves. "Everyone is trying to figure out what was behind the mini flash crash in the pound, but there are no clear answers right now," said Adam Button with ForexLive.com. In afternoon trade, pound sterling suddenly hit an intra (full story)