IOC STATEMENT     The International Olympic Committee (IOC) would like to send a message of support to London, following the tragic events of the past hours.  IOC President, Jacques Rogge, has personally expressed his sympathy in writing to the British Prime Minister, Tony Blair, and to the Mayor of London, Ken Livingstone.       It is a very sad fact of society today that tragic and shocking attacks of this nature can happen in any city at any time.        The IOC's thoughts are with all those who are personally affected.