New York City Mayor Michael Bloomberg, shown here during his September 11 tenth anniversary address, fears that joblessness could lead to riots. NEW YORK (CNNMoney) -- New York City Mayor Michael Bloomberg is worried that high U.S. unemployment could lead to the same kind of riots here that have swept through Europe and North Africa. "You have a lot of kids graduating college, [who] can't find jobs," said Bloomberg, during his weekly radio show on Friday. "That's what happened in Cairo. That's what happened in Madrid. You don't want those kinds of riots here."