Wall Street tumbles after Britons vote to leave EU

NEW YORK (Reuters) - Bank shares tumbled on Friday to lead Wall Street's biggest selloff in 10 months after Britain's decision to leave the European Union caught traders wrong-footed. The Dow Jones industrial average fell 611.21 points, or 3.39 percent, to 17,399.86, the S&P 500 lost 76.02 points, or 3.6 percent, to 2,037.3 and the Nasdaq Composite dropped 202.06 points, or 4.12 percent, to 4,707.98. (Reporting by Rodrigo Campos; Editing by Nick Zieminski)